SIM, eSIM or Roaming? Staying Connected in Asia
The three ways to get mobile data while travelling in Asia, how registration rules work, regional eSIMs for multi-country trips, and what to know about China's internet.
Short answer
Local SIMs are usually cheapest for longer stays but often require passport registration. eSIMs are the most convenient for short or multi-country trips if your phone supports them. Home roaming is easiest but can be expensive. In mainland China, many foreign apps and sites are blocked on local networks, which affects your choice.
Key points
- Check your phone supports eSIM and is unlocked.
- Local SIM registration usually needs your passport.
- Regional eSIMs suit multi-country trips.
- Plan ahead for mainland China's internet restrictions.
Mobile data is almost essential for travel in Asia: ride-hailing, maps, translation, payments and tickets all rely on it. You have three main options.
Compare the options
| Option | Best for | Pros | Cons |
|---|---|---|---|
| Local SIM | Longer stays in one country | Usually cheapest; local number | Registration with passport; shop visit |
| eSIM (local or regional) | Short or multi-country trips | Set up before you land; no shop visit | Phone must support eSIM; no local number with some plans |
| Home roaming | Very short trips, convenience | Nothing to set up | Often expensive |
Local SIMs
Airport kiosks and phone shops sell tourist SIMs. Many countries require registration with your passport, sometimes with a photo. Airport prices are convenient but can be higher than city shops.
eSIMs
If your phone supports eSIM and is unlocked, you can buy and install a data plan before you travel and activate it on landing. Regional eSIMs covering several countries suit multi-country trips. Check the coverage list and speed limits, and whether the plan includes a phone number (needed for some local apps).
Home roaming
Check your provider's daily or weekly travel passes. They can be good value for short trips; pay-as-you-go roaming can be very expensive.
Mainland China
Many foreign websites and apps — including major search engines, social networks and messaging apps — are blocked on local networks. Roaming on a foreign SIM or using some international eSIMs routes data differently and may give access, but rules and services change. Research current options before you go, and download offline maps and translation packs.
Practical tips
- Install key apps (ride-hailing, maps, translation, payment) before you arrive.
- Download offline maps for each city.
- Keep your home SIM for bank SMS codes.
- Carry a power bank — navigation drains batteries.
The bottom line
eSIMs are the easiest choice for most short trips; local SIMs for long stays; roaming for convenience at a price. Add the cost to your budget calculator and see the rest of the essentials in the packing list.
Questions readers ask
Can I keep my home number while using an eSIM?
On dual-SIM phones, yes. Keep your home SIM active for calls and SMS (watch roaming charges) and use the eSIM for data.
Do I need data in Asia?
In practice, yes: maps, translation, ride-hailing, mobile payments and train tickets increasingly depend on it.
