Estimates only — actual use depends on your apps, video quality, and habits.
Asia eSIM
The complete guide.
Best eSIM for travelling Asia
A regional Asia eSIM is built for the multi-country itinerary — one Flysimio plan that roams across East, Southeast, and South Asia, from Japan and South Korea to Thailand, Vietnam, Singapore, and Indonesia. A single QR keeps you online as you hop between countries and islands, with no swapping SIMs at each border. Plans are prepaid with no contract and no roaming surprises, and every plan includes free mobile hotspot and a 7-day money-back guarantee. For a Southeast Asia backpacking loop or a Japan-plus-Korea trip, the regional bundle is far simpler than buying a new eSIM in every country.
Regional Asia plan vs. buying per country
If you're only visiting one country — a week in Japan, say — our dedicated country eSIM is usually the cheapest choice. But for a trip across three or more countries, the Asia regional bundle wins on both convenience and often price: one plan roams automatically as you move from Thailand to Cambodia to Vietnam, so you're never stuck hunting for a local plan or a SIM shop on arrival. For island-hopping and overland routes through Southeast Asia, or a multi-stop Northeast Asia trip, the regional plan keeps things simple.
How to set up your Asia eSIM
Setup takes about two minutes. Confirm your phone supports eSIM (iPhone XS from 2018 and newer, most Android flagships from 2020), choose your Asia plan, and pay with card, Apple Pay, or Google Pay — your QR code arrives by email within seconds. Install it on Wi-Fi before you fly via Settings → Cellular → Add eSIM (iPhone) or Network & Internet → SIMs → Add eSIM (Android). It connects automatically when you land in your first Asian country and keeps working as you cross borders — no reinstalling at each stop. Because it activates on first use, you can buy well ahead of departure.
How much data do you need for an Asia trip
Data needs depend on how you travel, not just how long. For maps, messaging, translation apps, and email, around 300 MB a day is plenty, so a 5 GB plan covers a week. Add social media, food photos, and reels and you'll want closer to 700 MB a day; a 10–20 GB plan suits a two-to-three-week multi-country trip. Heavy streamers and anyone tethering a laptop should size up or choose an unlimited option. Note that remote islands and rural areas can have weaker coverage, so download offline maps for those legs — and you can top up mid-trip if you run low.
Hotspot, calls, and crossing borders in Asia
Your Asia eSIM roams across the coverage list, so you stay connected as you move between countries — no swapping when you fly from Bangkok to Hanoi or take the ferry between islands. Every plan includes free mobile hotspot for tethering a laptop or sharing with travel companions. As a data-only eSIM there's no local number, but that's rarely a limitation: WhatsApp, LINE, KakaoTalk, FaceTime, and Google Meet cover calls and messages over data — and these apps are the norm across much of Asia — while your home number stays reachable on your primary SIM.
Short trips vs. long Asian journeys
For a two-country city trip, a smaller 5 GB plan on a short validity is usually enough. For a multi-week Southeast Asia loop or a longer nomad stint, a 10–20 GB plan gives you room to navigate, translate, and share freely across every stop. Because Flysimio plans give you six months to activate, you can buy well ahead and the validity only starts when your eSIM first connects in the region. There's no contract and nothing to cancel — the plan simply ends when it's done, and you can top up or rebuy for your next Asian adventure.
