On this page
What Is an eSIM and Why Should Travelers Use One?
An eSIM — short for embedded SIM — is a digital SIM card built directly into your phone. Instead of swapping a tiny plastic chip at the airport (or hunting for a local SIM shop in a foreign city), you download a cellular plan over the internet and your phone connects to a network within minutes. No scissors, no adapters, no roaming shock.
For travelers, eSIM is a genuine game-changer. Here is why it has become the go-to choice for frequent fliers, digital nomads, and first-time adventurers alike:
- Instant setup: Buy a plan, scan a QR code, and you are connected — often in under two minutes.
- No physical SIM juggling: Keep your home SIM in your phone the whole trip. You run both simultaneously using Dual SIM mode.
- Keep your home number active: Calls and texts to your regular number still reach you. Friends and family do not need a new number.
- No roaming shock: You pay a flat, predictable price upfront — not a surprise bill when you land home.
- Eco-friendly: No plastic, no packaging, nothing to lose at the bottom of your bag.
How does eSIM stack up against the alternatives?
| Feature | Roamix eSIM | Carrier Roaming | Local SIM Card |
|---|---|---|---|
| Cost | Low, transparent pricing | High (often $10–$15/day) | Low–medium |
| Setup time | 2 minutes, before you fly | Zero (automatic, pricey) | 30–90 min at airport kiosk |
| Keep home number | Yes (Dual SIM) | Yes | No — new number |
| Works in multiple countries | Yes — regional plans available | Yes (varies by carrier) | Usually single country |
| Environmental impact | Zero plastic | Zero plastic | Plastic SIM card + packaging |
The verdict: for most travelers, eSIM beats roaming on cost and beats local SIM on convenience. It is the best of both worlds.
Is Your Phone eSIM Compatible?
Most smartphones launched after 2019 support eSIM, but it is always worth a quick check before you buy a plan. The easiest method: look for an EID (Embedded Identity Document) number in your phone settings — if it has one, it is eSIM-ready.
How to check on iPhone: Go to Settings > General > About and scroll down. If you see an "EID" number, your iPhone supports eSIM. Alternatively, dial *#06# and your EID will appear on screen alongside your IMEI.
How to check on Android: Go to Settings > About Phone > Status. Look for "EID" or "EID number." On Samsung devices this is sometimes under Settings > Connections > SIM Manager.
One important catch: your phone must be carrier-unlocked. If you bought your phone directly from a carrier on a contract, it may be locked to that network and unable to use a third-party eSIM. Check with your home carrier — most will unlock your device free of charge once your contract period is up, or if you ask nicely.
Here is a quick reference for popular eSIM-compatible devices:
| Brand | Compatible Models |
|---|---|
| Apple iPhone | XS, XS Max, XR, 11 series, 12 series, 13 series, 14 series, 15 series, 16 series (including Pro Max) |
| Samsung Galaxy | S20, S21, S22, S23, S24, S25 (all variants including Ultra), Z Fold 3–6, Z Flip 3–6 |
| Google Pixel | 3a, 4, 4a, 5, 6, 6a, 7, 7a, 8, 8a, 9 (all variants) |
| Other brands | Motorola Razr series, Huawei P40/P50 (limited), Microsoft Surface Duo, many 2022+ flagship Android devices |
If your device is not listed, a quick search for "[your phone model] + eSIM" will give you a definitive answer.
How to Choose the Right eSIM Plan for Your Trip
Choosing a plan comes down to three things: how much data you need, how many countries you are visiting, and how long you will be away. Get these right and you will never run out of data — or pay for gigabytes you never use.
How much data do you actually need?
Here is a practical data usage guide to help you estimate:
| Activity | Approximate Data Usage |
|---|---|
| Browsing the web, social media | ~50 MB/hour |
| Navigation (Google Maps, Apple Maps) | ~10 MB/hour |
| Standard-definition video streaming | ~500 MB/hour |
| HD video streaming | ~1.5 GB/hour |
| Voice/video calls (WhatsApp, FaceTime) | ~200 MB/hour |
| Music streaming (Spotify, Apple Music) | ~60 MB/hour |
A typical traveler who browses, navigates, and uses messaging apps — but streams video only occasionally — will use roughly 1–2 GB per day. A light user (maps and messaging only) might get by on 500 MB/day. A remote worker doing video calls and uploading content might need 3–5 GB/day.
Rule of thumb: estimate your daily usage, multiply by trip length, and add 20% buffer. For a 10-day trip with moderate usage, a 15 GB plan gives you comfortable headroom.
Regional plans vs. country-specific plans
If you are visiting a single country, a country-specific plan is almost always cheaper and gives you maximum data for that destination.
If you are hopping between multiple countries — say, a Europe interrail trip or a Southeast Asia backpacking route — a regional plan covers all destinations under one purchase. No switching, no buying a new eSIM every time you cross a border.
Roamix offers both options. You can browse plans by destination and find exactly what fits your itinerary — with transparent pricing and no hidden fees.
What happens when your plan expires?
Most plans have a validity window (e.g., 30 days from activation). When the validity ends, your eSIM data stops working — but the eSIM profile itself stays on your phone. If you need more time or data, you can top up directly from the Roamix app without reinstalling anything.
Browse Roamix plans for your destination →
How to Set Up Your eSIM Before You Fly — Step by Step
Setting up a travel eSIM is one of the easiest things you will do before a trip. The whole process takes about two minutes. Here is exactly how to do it.
Step 1: Buy your plan on Roamix
Head to roamix.app, select your destination and data package, and check out. You will receive a QR code by email almost instantly — no waiting, no shipping.
Step 2: Install your eSIM 1–2 days before departure
Do this at home while on Wi-Fi — not at the airport. Here is how:
On iPhone:
- Open Settings > Cellular > Add eSIM
- Tap Use QR Code
- Scan the QR code from your Roamix confirmation email
- Follow the on-screen prompts to add the plan
On Android (Samsung example):
- Open Settings > Connections > SIM Manager > Add eSIM
- Tap Scan QR code and scan your Roamix code
- Confirm the plan details and activate
The installation takes about 60–90 seconds. Your Roamix eSIM will appear as a second line in your phone settings.
Pro tip: Install before you leave so you do not need airport Wi-Fi to get set up. Once installed, the eSIM is on your device and ready to go — internet not required to use it.
Step 3: Configure Dual SIM settings
After installation, set your phone to use Dual SIM intelligently:
- Primary line (calls + SMS): your home SIM — so people can still reach you on your regular number
- Data line: your Roamix eSIM — for all internet activity abroad
On iPhone, go to Settings > Cellular and set your Roamix line as the default for cellular data. Keep your home line on for calls and texts.
Step 4: Arrive and connect
When your plane lands, turn on mobile data. Your phone will connect to a local network automatically through your Roamix eSIM. You do not need to touch a setting or hunt for a SIM shop. Open Maps, message your hotel, and get on with your trip.
Pro Tips for Getting the Most Out of Your Travel eSIM
A good eSIM plan gets you connected. These habits will keep your data lasting longer and your trip running smoother.
Pre-download offline maps before you fly. Open Google Maps or Maps.me at home and download the offline map for every city you are visiting. Navigation offline uses essentially zero data — a huge saving if you are moving around a lot.
Use WhatsApp, iMessage, and FaceTime for all calls. These apps use your data rather than carrier minutes, which means you can call home for free using your Roamix plan. This is especially important for international calls, which are expensive over a traditional carrier line.
Monitor your usage. Check remaining data in the Roamix dashboard (in the app or on the website) and also in your phone settings under Cellular Data Usage. Reset the counter at the start of your trip so the numbers are accurate.
Keep Low Data Mode OFF. Low Data Mode throttles background syncing and can actually make some apps feel sluggish without saving as much data as you might think. Better to manage usage consciously.
Top up from the Roamix app if you run low. No reinstall, no new QR code — just buy more data and it applies to your existing eSIM within minutes.
Do not delete the eSIM until your trip is completely over. Even if your data plan has expired, you might need the eSIM profile if you top up or visit again. Deleting it means reinstalling from scratch.
Label your eSIM in settings. Rename it to "Roamix Travel" (on iPhone: Settings > Cellular > tap the eSIM line > edit the label). This makes it easy to see which line is which, especially if you travel frequently and have multiple eSIM profiles installed.
eSIM for Multi-Country Trips — How to Stay Connected Everywhere
Multi-country travel used to mean a stack of local SIM cards and a lot of confusion. With a regional eSIM, you buy one plan and it works across an entire region — no swapping, no airport kiosks.
When to use a regional plan: If you are visiting 2+ countries in the same region (e.g., Europe, Southeast Asia, the Middle East), a regional plan is almost always more convenient and often cheaper than buying per-country. One plan, one QR code, seamless switching as you cross borders.
When to use country-specific plans: For a single-destination trip, or if you are visiting countries in very different regions, buying a dedicated plan for each country usually gets you more data for your money.
Switching mid-trip: If you start with a country-specific plan and then decide to extend your trip to neighboring countries, Roamix makes it straightforward to buy a supplementary plan. Install the new eSIM profile and set it as your default data line.
Coverage: Roamix covers 190+ countries — including popular travel destinations across Europe, Asia, the Americas, Africa, and the Pacific. Whether you are heading to Iceland or Indonesia, Tokyo or Tanzania, there is a plan for your trip.
Common eSIM Questions Travelers Ask Before They Fly
Do I lose my home number when I use a travel eSIM? No. Your home SIM stays in your phone and your number stays active. eSIM runs as a second line alongside your regular SIM.
Can I still use iMessage and SMS on my home number? Yes. iMessage and SMS from your home number work normally because your home SIM is still active and receiving messages.
Does eSIM work for mobile hotspot and tethering? Yes — most Roamix plans support hotspot. You can share your connection with a laptop, tablet, or travel companion's device.
When does my data plan actually start? Roamix plans typically activate when your device first connects to a local network at your destination — not when you install the eSIM. So installing a week before your trip will not eat into your validity period.
Can I install an eSIM if my phone is on iOS 16 or older? eSIM has been supported since iOS 12.1, so virtually any iPhone from the XS onwards running a reasonably current iOS version will work fine.
Ready to Travel Smarter?
eSIM has made international connectivity genuinely effortless. No more roaming bills, no more SIM-card scrambles at the airport, no more losing your home number for the duration of a trip. With a Roamix eSIM, you can be connected before your flight even takes off.
Browse by destination, pick your data allowance, and get your QR code in minutes. Your next adventure is waiting.