eSIM vs physical SIM for travel: which to use abroad and how to set it up
Roaming charges, a fiddly SIM tray pin and a shop at the airport used to be the choices. Most recent phones can now download a SIM before you leave. Here's how the options compare.
The three options side by side
| Your plan's roaming | Travel eSIM | Local physical SIM | |
|---|---|---|---|
| Setup | Nothing, or turn on roaming | Download from an app or QR code before you go | Buy in a shop or airport, swap the card |
| Your normal number | Works as usual | Still works (keep the home SIM in for calls and texts) | Not in the phone unless it has a second slot or eSIM |
| Local number | No | Usually no (most are data-only) | Yes |
| Cost | Free to expensive, depending on plan and country | Fixed price per GB or days | Often the cheapest per GB for long stays |
| Needs | Plan that covers the country | eSIM-capable, unlocked phone | Unlocked phone; sometimes ID to register |
Does my phone support eSIM?
Most flagship phones from around 2018 on, and many mid-range ones since, support eSIM, but not every model sold in every country does. On an iPhone, look for an Add eSIM option in the Mobile Data settings; on Android, look for Download a SIM or Add eSIM in the SIM settings. The phone also needs to be unlocked: a phone locked to one network will refuse other SIMs, plastic or not.
Setting up a travel eSIM without surprises
- Install at home, on Wi-Fi. The download needs a connection, and the QR code is often single-use, so don't delete the eSIM afterwards unless you mean to.
- Label the lines (for example “Home” and “Travel”) so the settings make sense later.
- When you land: set the travel eSIM as the line for mobile data, turn on data roaming for the travel eSIM (many need it, because they themselves roam on local networks), and turn data roaming off for your home line.
- Keep the home line on for calls, texts and bank security codes; incoming calls and texts may still cost money on some plans, so check.
- Turn off “allow mobile data switching” (iPhone) or the Android equivalent if you want to be sure data never falls back to the home line.
When it says “No service” abroad
- Data roaming is off on the travel eSIM (the most common cause).
- The plan hasn't started yet, or it's for a different country or region.
- The access point name (APN) didn't set itself; the eSIM seller's instructions list it.
- Restart the phone, then try picking a network manually in the network settings.
How much data to buy
Maps, messages and a bit of browsing use well under 1 GB a day; video and calls use much more. Plan it with the streaming data calculator, and see why phones drain faster on trips in battery drains faster when travelling.
Related
Mobile data running out fast · What airplane mode turns off · Power banks on planes · Streaming data calculator
Questions
Is an eSIM better than a physical SIM for travel?
For short trips it's usually easier: you install it before you leave and keep your normal SIM in for calls and texts. A local physical SIM can be cheaper for long stays and gives a local number.
Can I keep my phone number with a travel eSIM?
Yes. Most travel eSIMs are data-only, so you keep your home SIM active for calls and texts and set the eSIM as the line for mobile data.
Why does my travel eSIM say no service?
Most often data roaming is turned off for the eSIM, the plan hasn't started or is for a different country, or the APN didn't set itself. Turn on roaming for that line and restart.
Will I be charged roaming on my home SIM?
Possibly, if data roaming is on for it. Turn data roaming off for the home line and turn off automatic data switching so data only uses the travel eSIM.
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