7 eSIM Mistakes Travelers Make (and How to Avoid Them)

A travel eSIM is one of the simplest things you can buy for a trip — and still, a handful of avoidable mistakes account for nearly every "it doesn't work" message travelers send. None of them are hard to prevent; you just need to know where the traps are.

Here are the seven we see most, and how to sidestep each one.

1. Checking compatibility after you buy

Not every phone supports eSIM, and some that do are locked to a carrier. A two-minute check in your settings beats a refund request. Our compatibility guide shows exactly where to look on iPhone, Samsung and Pixel.

2. Installing it at the arrivals hall

The QR code needs an internet connection to download the profile. Install it on your home WiFi before you leave, and the plan simply activates when your phone sees a network at your destination. Installing it abroad works too, but only if you already have a connection — which is the problem you were solving.

3. Deleting the eSIM by accident

Swiping "Remove eSIM" in your settings to "tidy up" is the one action you cannot undo: most eSIM profiles install once. Leave it in place until the trip is over, even after it has expired.

4. Forgetting to turn data roaming on

Travel eSIMs work through roaming agreements, so the line needs data roaming enabled on that eSIM (and only that one). If you see "No service" after landing, this is the first setting to check — along with making sure the eSIM is selected as your data line.

5. Leaving roaming on for your home SIM

The flip side: if your home SIM is still allowed to use data abroad, your phone may quietly use it and bill you. Set the eSIM as the data line, and switch data roaming off on your physical SIM. Calls and SMS verification codes keep working on it either way.

6. Buying the wrong data size

Too little means topping up in a rush; too much means paying for data that expires. Work it out from what you actually do — see how much data you need abroad.

7. Starting the validity clock early

Some plans start counting from first connection, others from a fixed date. Check the plan details, and avoid connecting the eSIM at home to "test" it if the validity begins on first use.

The five-minute pre-flight checklist

• Phone is eSIM-compatible and carrier-unlocked.
• eSIM installed on WiFi, labelled clearly (e.g. "Japan data").
• Data roaming on for the eSIM, off for your home SIM.
• eSIM selected as the mobile data line.
• Offline maps downloaded as a backup.

FAQ

What if my eSIM still doesn't connect on arrival?

Toggle airplane mode on and off, confirm data roaming is on for the eSIM, and restart the phone. If it persists, contact support from the app or website — we can check the plan on our side.

Can I reinstall an eSIM if I deleted it?

Usually not with the same QR code, which is why we recommend never removing it before the trip ends. Reach out to support and we will advise on the next step.

Do I need to turn off my physical SIM?

No. Keep it active for calls and SMS codes; just make sure it is not the line used for mobile data while you are abroad.