Southeast AsiaJakartaIndonesia eSIM and Travel Guide: Stay Connected in Bali, Jakarta and Beyond
Indonesia's mobile coverage is excellent in Bali, Jakarta and Java's major cities, but drops quickly in remote islands, highland jungles and rural areas. Telkomsel has by far the widest reach across the archipelago. The easiest way to stay connected is a Roamix Indonesia eSIM, which activates on arrival at Ngurah Rai or Soekarno-Hatta without a SIM purchase. Budget 8 to 12 GB for a two-week trip that covers both cities and islands.
Key Takeaways
- Telkomsel has the widest coverage across Indonesia's 17,000 islands and is the only network worth trusting in remote areas.
- A Roamix eSIM activates automatically on arrival in Bali or Jakarta, saving you from airport SIM queues.
- Cash is still essential in Indonesia, especially outside tourist areas and at petrol stations.
- Most nationalities receive a free 30-day visa on arrival at Bali and major international airports.
- Budget 8 to 12 GB for two weeks covering both cities and island travel.
Quick Facts
Indonesia Connectivity
Get a Roamix Indonesia eSIM and land in Bali with data ready before you clear customs.
How to Stay Connected in Indonesia
Wifi quality varies enormously in Indonesia. Upscale hotels in Bali and Jakarta have fast connections. Local warungs, guesthouses and remote areas have slow or unreliable wifi. Do not rely on wifi alone for navigation or bookings.
Option
Best For
Notes
RecommendedRoamix eSIM
Most travellers, especially island hoppers
Activates on arrival without a SIM swap, works across Bali, Java and wherever Telkomsel has coverage, with no roaming bill.
Local physical SIM
Long stays needing a local Indonesian number
Very cheap data but requires a passport, a SIM swap and potentially a trip to a carrier outlet to activate.
Pocket wifi
Groups sharing one connection
Popular for groups in Bali but adds another device to charge and does not work on boat crossings or remote trails.
Carrier roaming
Very short layovers in Jakarta
Expensive and coverage on home carrier roaming in Indonesia can be inconsistent in remote areas.
For most Indonesia visitors, a Roamix eSIM on the Telkomsel footprint is the simplest and most reliable connectivity option across both urban and island destinations.
Get connected the moment you land in Indonesia.
Get your Indonesia eSIMMobile Networks in Indonesia
Indonesia is the world's largest archipelago and its network coverage reflects that challenge. Telkomsel dominates with the widest footprint across all 34 provinces, including remote islands and rural Java. In Bali, Jakarta and major tourist areas, 4G is fast and reliable. A Roamix Indonesia eSIM connects to the best available local network on arrival, with no SIM purchase or passport verification at a counter.
By far the most extensive coverage in Indonesia, including remote islands, rural Java, Lombok and highland Sumatra. Operates around 247,000 base stations covering 97% of the population. Leads on 5G speed with median 5G downloads around 66 to 88 Mbps.
The second largest operator following its Ooredoo and Hutchison merger. Strong in urban areas and competitive in 5G rollout. Good for Jakarta and Surabaya city use.
Formed by the April 2025 merger of XL Axiata and Smartfren. Growing its combined network with 5G investment. Strong in urban Java and Bali but thinner in remote areas.
Typical Speeds
Expect 20 to 60 Mbps on 4G in urban areas and 50 to 100 Mbps on 5G in Jakarta, Bali and Surabaya.
5G Status
Telkomsel leads 5G with coverage in Jakarta, Bali, Surabaya, Bandung and Batam. Indosat Ooredoo Hutchison also operates 5G in major cities. The merged XLSmart network is expanding 5G coverage through 2025 and 2026.
For island hopping beyond Bali and Lombok, prioritise a Roamix plan that rides the Telkomsel network. It is the only carrier with meaningful coverage on smaller and more remote Indonesian islands.
Outside the main tourist corridors, signal can drop to 3G or disappear entirely. Remote areas of Kalimantan, Papua, Maluku, Flores and the Nusa Tenggara chain are particularly patchy. Download offline maps and entertainment before leaving populated areas.
Indonesian networks use commonly supported LTE bands. Most modern unlocked phones work well across Telkomsel's 4G and 5G footprint.
Data Usage Guide
Indonesia trips require steady data for navigation in a country with complex signage, ride-hailing apps and WhatsApp communication with hotels and tour operators. Remote driving and boat journeys make offline maps essential.
Download offline Google Maps for every region you plan to visit over wifi before you leave your hotel. Coverage gaps on Bali's mountain roads, Komodo boat routes and rural Java are common.
Data by Activity
Light Use
5 to 8 GB
One week in Bali
Gojek, maps, Instagram sharing and WhatsApp coordination with your hotel and tours.
Standard
8 to 12 GB
Two-week trip across Bali, Lombok and Yogyakarta
Heavy navigation across changing regions, flight and ferry bookings, and regular photo sharing.
Heavy Use
15 GB or more
Island-hopping across the archipelago
Multiple regions, frequent WhatsApp coordination with boats and guides, and offline map downloads for each island.
Apps & Internet Freedom
Indonesia has an open internet with no systematic blocking of mainstream apps or social media. Every common app works normally on a Roamix Indonesia eSIM.
There is no general censorship of messaging, calling or social media apps. Some specific websites may be blocked by the government, but this does not affect mainstream travel apps. No VPN is needed for everyday use.
Fully available and the dominant messaging app in Indonesia.
FaceTime
Works normally over data and wifi with no restrictions.
Google Maps
Unrestricted and essential for navigating Bali and Jakarta.
Gojek and Grab
Both work fully. Gojek is the dominant local super-app in Indonesia for rides, food and services.
How to Set Up a Indonesia eSIM
Install your Roamix Indonesia eSIM over wifi before departure and it will connect automatically to Telkomsel or another local carrier when you land, with no SIM purchase or counter visit needed.
Works on eSIM capable phones including iPhone XS and newer, Google Pixel 3 and newer, and recent Samsung Galaxy models. The phone must be carrier unlocked.
- 1
Buy your plan on the Roamix Indonesia eSIM page before your trip.
- 2
Install the eSIM over wifi by scanning the QR code.
- 3
Label it Roamix and keep your home SIM for calls and SMS.
- 4
Enable data roaming on the Roamix line only.
- 5
Land in Indonesia and the eSIM connects automatically. Open Gojek or Google Maps right from the arrivals hall.
APN Note
Roamix configures the APN automatically on most devices. If data does not start, apply the APN from your activation email and toggle airplane mode.
Troubleshooting
If no data on arrival, confirm data roaming is on for the Roamix line, try selecting the network manually in settings and restart the phone.
Get connected the moment you land in Indonesia.
Get your Indonesia eSIMArrival Checklist
Confirm your Roamix eSIM is connected before leaving the arrivals hall, either at Ngurah Rai (Bali) or Soekarno-Hatta (Jakarta).
Download Gojek before landing. It is the dominant ride-hailing and delivery app in Indonesia and works more reliably at Indonesian airports than Grab for some routes.
Withdraw Indonesian rupiah at an airport ATM. Cash is essential at local restaurants, markets, petrol stations and smaller warungs.
Download offline Google Maps for Bali, Yogyakarta or whichever regions you are visiting, as remote roads and villages often have no signal.
Note the visa on arrival desk if you are from a country that pays a fee. Most nationalities receive 30 days free, but check before you fly.
How locals communicate
WhatsApp is the near-universal messaging and calling app across Indonesia, used for both personal and business communication including hotel bookings and tour operators.
Save key contacts like your hotel, driver and tour operator on WhatsApp before arriving. Most Indonesian businesses respond faster on WhatsApp than by email.
Airports in Indonesia
Ngurah Rai International Airport
Denpasar, Bali
Free wifi available in the international terminal, though speeds can be slow during peak arrival periods.
Install your Roamix eSIM before departure so it connects on landing. With Roamix already active, you can book your taxi via MyBluebird or Grab, confirm your villa address, and have Google Maps ready before you reach the taxi queue outside arrivals.
Soekarno-Hatta International Airport
Jakarta
Free IndiHome wifi available across all terminals. Can be slow in busy Terminal 3 Ultimate.
Soekarno-Hatta is a sprawling three-terminal complex. Activate your Roamix eSIM before landing to navigate the multi-terminal layout and book your Grab or compare the Railink Airport Train to Sudirman station in central Jakarta before you exit arrivals.
Juanda International Airport
Surabaya
Free wifi available across Terminal 1 and Terminal 2.
Surabaya is the gateway for East Java and the Bromo-Tengger-Semeru National Park. Installing Roamix before arrival means your Mount Bromo sunrise tour booking is confirmed and your driver's contact is ready the moment you land.
Lombok International Airport
Mataram, Lombok
Free wifi available in the main terminal.
Lombok International is 45 minutes from Senggigi and about 90 minutes from the Kuta Lombok surf area. Install Roamix before arrival and book your car transfer directly from the arrival hall using Grab or the Lombok tourism board transfer service.
Visa & Entry for Indonesia
Indonesia offers a free 30-day visa on arrival (VOA) at Ngurah Rai International Airport (Bali), Soekarno-Hatta (Jakarta) and over 30 other entry points to nationals of over 90 countries including most of Europe, the US, UK, Australia, Japan and ASEAN countries. This can be extended once for another 30 days at an immigration office.
eVisa / ETA
Nationalities not on the free VOA list may apply for a paid visa on arrival for IDR 500,000, or apply in advance through the e-VOA system online. Some nationalities require a full visa from an Indonesian embassy.
Passport validity
Your passport must be valid for at least 6 months beyond your arrival date.
Onward ticket
Proof of onward travel and confirmed accommodation are required at immigration.
Keep your Roamix eSIM active to present hotel confirmation on your phone at the immigration desk and to book your first Gojek ride before leaving the airport.
Entry rules change. Always confirm current requirements with the Indonesian Directorate General of Immigration before booking.
Get connected the moment you land in Indonesia.
Get your Indonesia eSIMMoney & Payments in Indonesia
The Indonesian rupiah is cash-forward outside of tourist areas and major malls. Always keep enough cash for petrol, local markets, remote warungs and temple entrance fees.
Cash vs Card
Cards are accepted at Bali resorts, international hotels and larger restaurants, but cash is needed almost everywhere else. ATMs can be unreliable on smaller islands, so withdraw enough before departing the mainland.
ATMs
ATMs are available in Bali, Jakarta and major cities but rare on small islands. Always choose to be charged in IDR rather than your home currency to avoid poor dynamic conversion rates.
Payment Apps
GoPay (within Gojek) and OVO are dominant local digital wallets. QRIS QR codes are accepted at an increasing number of small businesses. A connected Roamix eSIM keeps your banking and payment apps active.
Daily Budget
Budget travellers in Bali can manage on 200,000 to 400,000 IDR a day for local food, scooter hire and guesthouses. Mid-range travellers spend 600,000 to 1,500,000 IDR. Bali is pricier than Java or Lombok.
Data cost: Carrier roaming can exceed 300,000 IDR a day in Indonesia. A Roamix eSIM plan covers a typical multi-week trip for a fraction of that cost.
Getting Around Indonesia
Indonesia's transport is as diverse as its geography, from Jakarta's modern airport train and MRT to Bali's scooter-centric roads, inter-island ferries and domestic flight hops between major destinations.
Gojek and Grab
Gojek is Indonesia's homegrown super-app covering rides, food delivery and services. Both require an active data connection. Indispensable in Bali and Jakarta.
Scooter hire in Bali
The most common way to explore Bali independently. Use Google Maps offline or downloaded to navigate between temples and beaches where signal is patchy.
Jakarta MRT and KRL commuter rail
Jakarta's growing MRT and commuter rail network use the Jakcard or bank card tap system. A connected phone lets you check live departures and navigate the multi-modal system.
Domestic flights
Flights are the practical way to reach Lombok, Manado, Makassar and eastern Indonesia. A Roamix eSIM manages mobile boarding passes and rebooking if schedules change.
Regions & Travel
Indonesia is one of the world's most diverse travel destinations, stretching across three time zones and encompassing ancient temples, tropical beaches, active volcanoes and some of the richest marine biodiversity on earth. A connected phone is essential for navigating between these very different worlds, especially on the road between islands.
Best time to visit: May to September is the dry season across Bali and the south. The best surf and diving conditions depend heavily on which coast and which island you visit. Avoid Bali during school holidays when prices surge.
Bali
The world's most complete travel destination: temple ceremonies at Pura Tanah Lot and Pura Besakih, rice terrace walks in Tegallalang and Jatiluwih, surf breaks from Kuta to Uluwatu, yoga and cafes in Ubud, and beach clubs in Seminyak and Canggu. Telkomsel Hyper 5G covers Denpasar, Kuta, Seminyak, Canggu and Nusa Dua.
Signal: Excellent 4G and 5G coverage across the south including Seminyak, Kuta, Canggu and Ubud. Signal thins in the interior mountains and some northern coastal villages. Download offline maps for temple drives and rice terrace walks.
Java and Jakarta
Java is the cultural and economic heart of Indonesia. Jakarta is the sprawling capital, but Yogyakarta is the cultural soul, the base for visiting Borobudur (the world's largest Buddhist temple) and Prambanan (the great Hindu temple complex). The volcanic slopes of Merapi and Bromo are accessible from Yogyakarta and Surabaya.
Signal: Strong 4G and 5G in Jakarta and major Java cities. Yogyakarta has reliable Telkomsel 4G at Borobudur and Prambanan. Volcanic trailheads at Merapi and Bromo have usable signal at the base but drop on summit approaches.
Lombok and the Gili Islands
Lombok is Bali without the crowds: Mount Rinjani's crater lake, the pink sand beach of Tangsi (Pink Beach), and the traditional Sasak villages of central Lombok. The three Gili Islands (Trawangan, Meno, Air) have no motorised vehicles and deliver some of the finest snorkelling and diving in Southeast Asia.
Signal: Telkomsel 4G in Mataram, Senggigi and the main Gili island piers. Gili Trawangan has usable 4G on the main strip. Remote Lombok beaches including Mawun and Selong Belanak have intermittent signal. Download offline maps of the islands.
Komodo and East Nusa Tenggara
Labuan Bajo on Flores Island is the gateway to Komodo National Park and its population of the world's largest lizard. The Padar Island viewpoint offers one of the most photographed landscapes in Southeast Asia. Pink sand beaches on Komodo Island and the manta ray cleaning stations of Manta Point are extraordinary diving destinations.
Signal: Telkomsel 4G in Labuan Bajo town and at ranger stations on Rinca and Komodo islands. Offshore on dive boats and in open water, signal is absent. Download offline maps of all park islands before departing Labuan Bajo harbour.
Sumatra and Borneo
Sumatra offers the Toba Lake caldera (the world's largest volcanic lake), orangutan encounters at Bukit Lawang, and the Sumatran tiger heartland of Kerinci Seblat National Park. Indonesian Borneo (Kalimantan) is the last wild frontier, with proboscis monkeys in Tanjung Puting National Park and Dayak longhouse culture on the Mahakam River.
Signal: Telkomsel 4G in major Sumatra cities and at Toba lake resorts. Orangutan trekking in Bukit Lawang is on-network in the main village. Deep Borneo jungle rivers and Tanjung Puting interior are largely off-network. Satellite devices are standard for extended river expeditions.
Hidden Gems
Ijen volcano and blue fire
volcanic siteEast Java
The world's only electric-blue volcanic fire, visible on night hikes from around 2 AM, caused by igniting sulphuric gases in the acidic crater lake.
Signal: No signal on the crater rim or during the descent. Good Telkomsel 4G in Banyuwangi town at the base.
Use your Roamix eSIM to book a guide and overnight accommodation in Banyuwangi before the hike, and download the trail route offline before you leave town.
Raja Ampat
marine parkWest Papua
The most biodiverse marine environment on Earth, with 75 percent of the world's coral species. Best for manta ray aggregations, wobbegong sharks and pygmy seahorses.
Signal: Telkomsel has towers on the main inhabited islands including Waisai on Waigeo and the Sorong gateway city. Remote dive sites, uninhabited islands and liveaboard routes are entirely off-network. A satellite communicator is strongly recommended for extended stays.
Arrange all permits, dive operators and accommodation via your Roamix eSIM before leaving Sorong. Liveaboard operators including Papua Diving and Dewi Nusantara require booking 6 to 12 months in advance.
Nusa Penida
IslandBali
A 45-minute speedboat from Bali, Nusa Penida has become the most instagrammed island in Southeast Asia for the Kelingking Beach T-Rex cliff viewpoint. Snorkelling with manta rays at Manta Point is world-class.
Signal: Telkomsel 4G at the main port in Toyapakeh and at Kelingking Beach and Crystal Bay. Remote cliff paths and the T-Rex hill trails can lose signal. Download offline maps of the island before taking the speedboat from Sanur or Padang Bai.
Klook and Viator offer day trip packages from Bali that include snorkelling and the Kelingking viewpoint. Book in advance via Roamix data as operators cap daily boat numbers.
Tegallalang Rice Terraces
cultural landscapeUbud, Bali
The most photographed rice terraces in Bali, worked on the subak communal irrigation system that is UNESCO listed. The light is best in the morning before the hawker stalls open and tour groups arrive.
Signal: Telkomsel 4G at the main viewpoint area and entrance. Signal can drop on longer rice terrace walks away from the main path.
A 15-minute drive north of Ubud. Roamix data lets you check sunrise times, navigate the back road from Ubud and book a swing above the terraces at Bali Swing in advance.
Borobudur Temple
archaeological siteCentral Java
The world's largest Buddhist temple, built in the 9th century from two million stone blocks with 2,672 relief panels and 504 Buddha statues. The sunrise view from the top tier over the Kedu Valley with Merapi volcano in the background is one of Indonesia's great experiences.
Signal: Telkomsel 4G throughout the Borobudur Park complex and in Magelang town. The temple top levels have good signal.
Borobudur sunrise packages sell out weeks in advance. Book via the official Borobudur Park website or Klook on your Roamix data before arriving in Yogyakarta.
Prambanan Temple Complex
archaeological siteCentral Java
The largest Hindu temple complex in Southeast Asia, dedicated to the Trimurti, with 240 temples built in the 9th century. The Ramayana ballet performed at the outdoor Trimurti Theatre at sunset is one of Java's great cultural experiences.
Signal: Excellent Telkomsel 4G throughout the Prambanan complex and surrounding park.
The Ramayana ballet runs May to October at the open-air Trimurti Theatre. Book tickets via the Prambanan Park website on your Roamix data at least a week in advance, as performances sell out during high season.
Munduk
mountain regionNorth Bali
A clove and coffee farming village in Bali's northern highlands, with twin waterfalls at Melanting and Munduk, jungle trekking and temperatures of 18 to 22C compared to the coast.
Signal: Telkomsel 4G in Munduk village. Waterfall trails into the forest below can drop to 3G or no signal. Download offline maps of the Munduk waterfall circuit before heading out.
Munduk is a three-hour drive from Seminyak. Roamix data lets you check trail conditions and book a night at Puri Lumbung Cottages before the drive north.
Baliem Valley
Remote RegionPapua
The Baliem Valley is home to the Dani people, who maintained a Stone Age lifestyle largely undisturbed until the 1930s. The Grand Baliem Valley Festival in August brings traditional Dani war re-enactments, pig feasts and tribal dances.
Signal: Telkomsel 4G in Wamena town and at the main village market areas. Remote highland trekking routes between Dani villages go off-network. Satellite devices are standard for multi-day highland treks.
Wamena is accessible only by air from Jayapura or Timika. Use Roamix data in Jayapura to book flights via Traveloka and finalize Wamena logistics before the connecting flight.
Tana Toraja
cultural regionSouth Sulawesi
The Torajan people have the most elaborate funeral traditions in the world, with water buffalo sacrifices, coffins hung on cliffsides and funerals that can last weeks. The boat-shaped tongkonan houses are among the most distinctive architecture in Southeast Asia.
Signal: Telkomsel 4G in Rantepao town, the main base for Toraja visitors. Remote highland villages and cliff burial sites can have weak signal. Download offline maps of the Toraja area in Makassar before flying up.
Toraja funeral ceremonies are best witnessed through a local guide with genuine family relationships. Book a reputable guide via the Rantepao Tourism Association before arriving.
Selong Belanak Beach
coastal regionLombok
One of Southeast Asia's most beautiful beaches, a wide horseshoe of white sand with long, consistent beginner surf waves and almost no commercial development compared to Bali's beaches.
Signal: Telkomsel 4G in Selong Belanak village and at the main beach. The remote roads through central Lombok connecting Mataram to the south coast can drop to 3G in highland sections.
Selong Belanak is 90 minutes from Lombok Airport. Roamix data lets you book a surf lesson with Selong Belanak Surf Club, navigate the winding south Lombok road and check surf conditions before the drive.
Events & Best Seasons
Nyepi Day of Silence
religiousBali · March (Balinese New Year, date varies each year)
Bali's most sacred Hindu holiday, during which the entire island falls silent for 24 hours. No lights, no cars, no noise and no internet service as part of the observance. Ngurah Rai Airport is the only airport in the world that closes for a religious holiday. The Ogoh-Ogoh demon parade effigies are paraded and burned the night before.
Network note
Mobile internet and wifi are suspended across Bali for the full 24 hours of Nyepi by order of the local government. Plan data use and downloads accordingly.
Roamix tip
Download everything you need the day before Nyepi as your Roamix eSIM will also be offline on the island. Use the silence to rest and enjoy a genuinely unique cultural experience.
Bali Arts Festival
CulturalTaman Werdhi Budaya, Denpasar · June to July
A month-long celebration of Balinese arts at the Taman Werdhi Budaya art centre in Denpasar, with daily performances of kecak dance, Legong, Barong and traditional gamelan music from Bali's villages competing in provincial competitions. The opening parade through Denpasar is free and spectacular.
Network note
Good 4G coverage at the venue in Denpasar and along the parade route. Crowds are large but do not degrade network performance.
Roamix tip
Use your Roamix eSIM to check the daily schedule on the Bali Arts Festival official website and book transport to Denpasar from Seminyak or Ubud for evening performances.
Galungan and Kuningan
religiousBali (island-wide) · June 17 and June 27, 2026 (every 210 days on the Balinese calendar)
The most important cycle in the Balinese Hindu calendar, celebrating the victory of dharma over adharma. Penjor bamboo poles line every road, temple ceremonies run around the clock and Balinese families make elaborate offerings. Kuningan on June 27 marks the end of the two-week cycle when the ancestral spirits return.
Network note
Coverage across Bali is normal during Galungan. Temple ceremony areas can get crowded but 4G remains functional throughout.
Roamix tip
Galungan and Kuningan are when Bali is most intensely itself. Roamix data helps you find the nearest temple ceremony and book a cultural guide on Airbnb Experiences for a private ceremony visit.
Ubud Writers and Readers Festival
artsUbud, Bali · October, five days
One of Asia's most celebrated literary festivals, bringing 200 international and Indonesian authors to Ubud's galleries, temples and rice terrace stages for five days of talks, readings and workshops.
Network note
Excellent Telkomsel 4G throughout Ubud during the festival. Streaming or posting from festival venues is straightforward.
Roamix tip
Individual session tickets sell out fast for headline international authors. Book via the UWRF website on your Roamix data as soon as the programme is released in August. Combine the festival with dinner at Locavore, booked months ahead, for the full Ubud experience.
Grand Baliem Valley Festival
CulturalWamena, Papua · August, three days (approximately August 8 to 10)
The largest cultural gathering in Indonesian Papua, with hundreds of Dani warriors in traditional koteka dress staging war re-enactments with stone-tipped arrows and shields, followed by traditional cooking and dance representing dozens of Papuan highland villages.
Network note
Telkomsel 4G is available in Wamena town but crowds at the festival grounds can strain signal. Pre-download maps and logistics before the event.
Roamix tip
Wamena is accessible only by air from Jayapura. Book flights 3 to 4 months in advance via Traveloka on your Roamix data and confirm accommodation at Baliem Valley Resort well ahead.
Kuta Sea Games Surf Competition
SportsKuta Beach, Bali · June to July
International surf competition held at Kuta Beach, one of the original surf destinations in Asia, where Western surfers discovered Indonesian waves in the 1970s.
Network note
Kuta Beach has strong Telkomsel 4G. Competition days attract large crowds but coverage at the beach remains solid.
Roamix tip
Track daily heat schedules on the World Surf League website via your Roamix data and position yourself at the optimal viewing point on the beach before the best competitors hit the water.
Mount Batur Sunrise Hike
CulturalKintamani, Bali · Year-round, departing 1 AM to 2 AM nightly
A guided 2-hour pre-dawn hike to the rim of Mount Batur's active volcano to watch the sun rise over Lake Batur and the Agung volcano in the distance. The Batur Trekking Association requires guides for the official route.
Network note
Telkomsel signal is available at the Toya Bungkah base village but drops on the upper crater approach. Download your trail map offline before leaving your accommodation.
Roamix tip
Book via a reputable Ubud hotel or operator on your Roamix data the day before. Gear up with a warm layer as the crater rim reaches 10 to 15C before sunrise.
Batik Day and Cultural Week
CulturalYogyakarta and Solo, Java · October 2
Indonesia's National Batik Day celebrates the UNESCO recognition of batik as cultural heritage. Yogyakarta's batik workshops in the Kraton district open for demonstrations and visitors can create their own batik cloth.
Network note
Strong Telkomsel 4G throughout Yogyakarta and the Kraton district. No connectivity disruptions during the celebration.
Roamix tip
Book a hands-on batik workshop at Batik Plentong or Batik Winotosastro in Yogyakarta's Kraton neighbourhood via your Roamix data in advance of October 2.
Eid al-Fitr (Idul Fitri)
religiousNationwide, strongest in Java · Approximately March to April (lunar calendar, date shifts each year)
The largest annual movement of people in the world: 30 million Indonesians travel to their home villages (mudik) in the week before Eid. Jakarta essentially empties. Villages across Java and Sumatra fill with family gatherings and the scent of ketupat and rendang.
Network note
Networks across Java and Sumatra are under intense strain during the mudik travel period. Telkomsel deploys extra capacity but expect slower speeds on major transport corridors.
Roamix tip
Book all intercity transport via Traveloka on your Roamix data weeks in advance. Travel on the day before Eid and the day after is extremely difficult as airports and train stations reach capacity.
Nyepi Ogoh-Ogoh Parade
religiousBali (island-wide, especially Denpasar) · Night before Nyepi, March (Pengerupukan eve)
The eve of Nyepi sees enormous papier-mache demon effigies (Ogoh-Ogoh) paraded through village streets and burned at crossroads to cleanse the island of evil spirits before the Day of Silence. Each banjar (community group) constructs its own Ogoh-Ogoh, and the competition for the most spectacular creation is fierce.
Network note
Telkomsel 4G is active across Bali on Pengerupukan night. Crowds are large in Denpasar but data remains usable for maps and messaging.
Roamix tip
Use your Roamix eSIM to find parade routes via Google Maps before heading out, as each village has its own procession route. Position yourself near a major crossroads in Denpasar or your nearest banjar for the best viewing.
Spring
February to April sees the wet season tapering off. Nyepi falls in March and is a unique cultural event worth planning around.
Summer
June to August is the dry season in Bali and the south, the best time for most tourists with low humidity and calm seas. Prices and crowds peak during European summer holidays.
Fall
September and October remain dry in the south and are ideal for diving in Komodo and Lombok with good visibility and calmer crossings.
Winter
November to January is wet season in most of Indonesia. Bali's west coast beaches face roughest conditions, while the east coast remains calmer.
Remote Work from Indonesia
Bali is one of the world's most popular digital nomad destinations, with a large coworking scene in Canggu and Ubud, affordable living and a supportive community. Jakarta also has excellent coworking infrastructure.
Coworking spaces in Canggu and Ubud have fast fixed connections. A Roamix eSIM on the Telkomsel network covers the drives between locations and acts as a reliable backup when venue wifi is slow.
Bali's Canggu neighbourhood has the highest concentration of coworking spaces and nomad-friendly cafes in Indonesia. Choose spaces close to the beach road for reliable power and AC.
Get connected the moment you land in Indonesia.
Get your Indonesia eSIMLocal Tips for Indonesia
Language
Bahasa Indonesia is the national language and a connected translation app helps outside tourist areas. Most Bali hospitality staff speak English, but village communities and local warungs often do not.
Tipping
Tipping is appreciated but not obligatory. Around 10 percent in sit-down restaurants, 20,000 to 50,000 IDR for drivers and guides, and more for multi-day trekking guides who carry your gear.
Food & Dining
Indonesian food is extraordinary, from nasi goreng and satay to Balinese babi guling roast pork and Javanese gudeg jackfruit curry. Warungs are the local equivalent of hawker stalls, serving fresh and affordable food across the country.
Transport
In Bali, scooter hire costs around 60,000 to 80,000 IDR per day and is the most flexible way to explore. In Jakarta, use Gojek or the MRT. On the Gili Islands there are no motorised vehicles, so horse cart and cycling are the only options.
Emergency Numbers
general
112
police
110
ambulance
118
fire
113
Essential Apps
Gojek
Indonesia's dominant super-app for ride-hailing, food delivery, payments and services. Essential for getting around Bali and Jakarta.
Traveloka
The main platform for booking domestic flights, ferry tickets and hotels across Indonesia, with better Indonesian route coverage than global booking sites.
Google Maps with offline areas
Download offline map packs for each island or region before leaving wifi. Critical for navigating Bali's back roads and Yogyakarta's temple complexes.
Safety & Health in Indonesia
Indonesia is generally safe for tourists, with the main risks being petty theft in busy tourist areas, occasional volcanic activity and water and food safety. Bali and the major tourist islands are well set up for visitors.
Keep your Roamix eSIM active to receive volcanic activity alerts from the Centre for Volcanology and Geological Hazard Mitigation, which issues notifications for Mount Agung, Merapi and other active volcanoes.
Health Note
Dengue fever is endemic and transmitted by daytime mosquitoes. Use repellent consistently. Bali belly (traveller's diarrhoea) is common from contaminated water or food. Drink only bottled or filtered water.
Water Safety
Do not drink tap water anywhere in Indonesia. Bottled water is cheap and ubiquitous. Be cautious with ice in local warungs outside tourist areas.
Frequently Asked Questions
Indonesia eSIM, connectivity, and travel
What is the best eSIM for Bali and Indonesia?
Roamix is a top choice for Indonesia because it connects to Telkomsel, the network with the widest coverage across the archipelago including the islands. You install it before you fly and it activates at Ngurah Rai or Soekarno-Hatta without a SIM queue.
Do I need a SIM card for Bali?
You do not need a physical SIM. A Roamix Indonesia eSIM gives you local data from the moment you land, without passport verification at an airport SIM counter or swapping out your home SIM.
What is the most affordable eSIM for Indonesia?
Roamix offers Indonesia plans that significantly undercut carrier roaming. For a two-week Bali and Java trip, an 8 to 12 GB plan covers most needs at a fraction of daily roaming charges.
Does an eSIM work across all the Indonesian islands?
It depends on the network. Telkomsel has the widest coverage across Indonesia's 17,000 islands, including the Gili Islands, Lombok and parts of eastern Indonesia. More remote islands like Raja Ampat and some Nusa Tenggara islands have very limited signal on any network.
How do I set up a Roamix eSIM for Indonesia?
Buy your plan on the Roamix Indonesia eSIM page, install over wifi before departure, then enable data roaming on the Roamix line. It connects to Telkomsel or another local carrier automatically on landing.
Can I use WhatsApp and Google in Indonesia?
Yes. Indonesia has an open internet and all mainstream apps including WhatsApp, FaceTime, Google and Gojek work normally on a Roamix Indonesia eSIM without a VPN.
How much data do I need for two weeks in Indonesia?
Most travellers covering Bali and Java over two weeks use 8 to 12 GB for Gojek, Google Maps, WhatsApp with hotels and tour operators, and regular photo sharing. Add more if you stream or tether a laptop.
Do I need a visa to visit Bali?
Nationals of over 90 countries including the US, UK, EU, Australia and Japan receive a free 30-day visa on arrival at Ngurah Rai airport. This can be extended once for another 30 days at a local immigration office.
Will my eSIM work on the Gili Islands?
Yes. The Gili Islands off Lombok have reasonable Telkomsel 4G coverage in the beach areas. There are no motorised vehicles on the Gili Islands, so your eSIM helps with navigation and WhatsApp coordination instead.
Do I still need cash in Bali?
Yes. Cash is essential for local warungs, markets, temples, scooter hire and rural areas. Keep at least 200,000 to 500,000 IDR on you at all times. A connected Roamix eSIM keeps your banking app active to locate ATMs when needed.
What happens to my eSIM during Nyepi in Bali?
Mobile internet and all communications are suspended across Bali during the 24-hour Nyepi Day of Silence by local government mandate. Your Roamix eSIM will not function on Bali during this period. Plan accordingly and download what you need the day before.
Is airport wifi at Ngurah Rai enough or should I get a Bali eSIM?
Airport wifi at Ngurah Rai is available but the real-world taxi queue and ride-hailing process requires a connected phone outside the terminal. A Roamix eSIM keeps you online through customs and into your first Gojek booking.
Will my Roamix eSIM work at Borobudur and Prambanan in Central Java?
Yes. Telkomsel 4G covers the Borobudur Park complex, Magelang town and the Prambanan temple precinct fully. You can use your Roamix eSIM to check the sunrise ticket window at Borobudur, navigate between the two UNESCO sites and book the Ramayana ballet at the Trimurti Theatre at Prambanan.
Does my Roamix eSIM work at Juanda Airport in Surabaya?
Yes. Telkomsel 4G is available across Juanda International Airport's Terminal 1 and Terminal 2. Surabaya is the gateway for East Java including the Bromo-Tengger-Semeru National Park. Your Roamix eSIM lets you confirm your Mount Bromo sunrise driver and download offline maps of the Tengger caldera area before leaving the airport.
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Stay connected across Indonesia with Roamix
Skip the SIM queues at Ngurah Rai and land with local data running. A Roamix Indonesia eSIM activates automatically, works from Bali to Java and covers the islands on the Telkomsel network.
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