eSIM for Japan & South Korea

A Japan & South Korea eSIM is a digital SIM card that lets you instantly access mobile data in Japan & South Korea without a physical SIM card. You download a carrier profile to your phone by scanning a QR code — no store visit, no waiting for delivery. Once your device connects to a local network in Japan & South Korea, your plan activates automatically. Roamix partners with leading local carriers to provide 4G LTE and 5G data in Japan & South Korea.

Activating your Japan & South Korea eSIM is straightforward. After purchase, scan the QR code from your Roamix confirmation email (or download it from your account dashboard) using your phone's camera or eSIM settings. On iPhone: Settings > Cellular > Add eSIM. On Android: Settings > Network & Internet > SIMs > Add SIM. Install it before you travel, then enable Data Roaming for the Roamix plan when you arrive in Japan & South Korea. You'll connect to the local partner network automatically.

Yes. With a Roamix eSIM for Japan & South Korea, your primary physical SIM card stays fully active. People can call and text you on your usual number as normal. The eSIM works alongside your existing SIM in dual-SIM mode — your home SIM handles calls and texts while the Roamix eSIM provides affordable mobile data in Japan & South Korea. Make sure to set Roamix as your mobile data line in your phone's cellular settings.

We recommend installing your Japan & South Korea eSIM before you travel — at home on Wi-Fi — so you're not troubleshooting at the airport. Your plan won't start consuming data until your device connects to a supported local network in Japan & South Korea. This means installing days in advance won't waste any plan time. Simply enable Data Roaming for the Roamix eSIM line when you land, and you'll be online within seconds.

Most modern smartphones support eSIM, including iPhone XS and newer (all models), Samsung Galaxy S20 series and newer, Google Pixel 3 and newer, and many other Android flagship devices released since 2018. Your device must also be carrier-unlocked — not locked to a home carrier. Use our free eSIM Compatibility Checker to verify both requirements in seconds.

Roamix partners with leading mobile network operators in Japan & South Korea to deliver the best available speeds. 4G LTE is available across all supported destinations, and 5G is available in Japan & South Korea where local infrastructure supports it. Actual speeds depend on your location within the country, local network load, and your device's band support. Major urban areas typically experience the fastest speeds.

You'll receive data usage alerts at 50% and 80% so you can plan ahead. If your data runs out in Japan & South Korea, your internet connection simply pauses — there are no automatic charges or overages. You can top up additional data instantly from your Roamix account without reinstalling your eSIM. Your connection resumes within seconds. There are never any hidden or surprise charges.

Roamix offers a 14-day refund window for eSIM plans that have not been installed or activated. If you purchased a Japan & South Korea eSIM plan and changed your travel plans, contact support@roamix.app within 14 days of purchase with your order number. Once a QR code has been scanned and the eSIM profile installed on a device, the plan is considered activated regardless of data usage, and refunds are generally not available.

The most affordable Roamix Japan & South Korea eSIM starts at $4.15 for 1GB of data, valid for 1 days. Pricing varies by data amount and validity period — larger plans offer better per-GB value. Browse all Japan & South Korea plans above to compare options. All Roamix plans include hotspot tethering at no extra cost.

You don't need a physical SIM card for Japan & South Korea if your phone supports eSIM (most smartphones since 2018 do). A Japan & South Korea eSIM from Roamix lets you download a digital carrier profile before you travel — no store visit, no card swap, no waiting at the airport. Your original SIM card stays in your phone, so your home number remains active for calls and texts while the Roamix eSIM provides affordable mobile data.