Travel eSIM: how to compare plans and avoid costly mistakes

A fictional example

Fictional example: Liam lives in Dublin and is spending two weeks in Thailand and Vietnam, relying on maps, ride bookings and family chats. His Irish plan covers roaming in the EU, but not in Asia. He first asks his provider about a travel add-on, then compares it with two travel eSIM offers.

The cheapest eSIM covers Thailand only; a regional plan costs a little more but includes both countries. Liam checks that his phone is unlocked and installs the eSIM at home over Wi-Fi the evening before his flight. After landing in Bangkok, he switches mobile data to it and keeps his Irish number on for calls and texts.

Do you actually need a travel eSIM?

With a plan from an EU country, “roam like at home” applies. The legal basis is the EU Roaming Regulation 2022/612, which is set to run for ten years, until 2032. According to the EU portal Your Europe, the regime covers all EU countries, the EEA countries Iceland, Liechtenstein and Norway, and, since 1 January 2026, Moldova and Ukraine. Other countries are not covered, although many operators choose to extend their offers to them. Roaming outside the EU/EEA, particularly data roaming, can be expensive.

For a trip to Japan, Canada or the United States, start with your own plan. Apple advises checking whether it includes international roaming at no extra cost; some countries may already be included, and your provider may offer cheaper travel packages to book in advance. Only if these do not suit you is it worth comparing travel eSIMs.

What exactly applies inside the roaming area, and where the exceptions are, is covered in Roaming in Europe: where it stays free and where it gets expensive.

Provider add-on, local eSIM or global provider?

Apple's travel advice points to three ways to get mobile data abroad. They differ mainly in how you buy them, whether you get a phone number and the conditions attached.

Which questions should you answer before buying?

According to Apple, travel eSIM plans differ mainly in data allowance, duration and coverage. A low price is little help if a country on your route is missing or the data runs out early. Note the answers to these questions for each offer.

1. Coverage: Does the plan cover exactly your destination, or a region? On a multi-country trip, is every country included, even a short side trip?
2. Data allowance: How much do you need for maps, messaging, timetables and photos? Can you top up if it runs out?
3. Validity: How many days does the plan last, and when does the clock start: at purchase, at installation or at the first connection abroad? Do the terms say so clearly?
4. Number and hotspot: Do you need a phone number at your destination? Do you want to connect a laptop through your phone, and does the offer allow it?
5. Provider: Is there clear company information, reachable customer support and a clear rule if the eSIM does not work? Do you download the provider's app only from the official App Store or Google Play?

Tip: Divide the total price by the number of days you are away. That shows whether one larger package for the whole trip is cheaper than several small ones.

For downloading a provider's app safely, see Installing an app: finding the right provider.

Can your phone use a travel eSIM?

An eSIM is a digital SIM built into your phone. Instead of inserting a card, you download the provider's profile using a QR code or an app. For using eSIM while travelling, Apple lists iPhone XS, XS Max, XR or later. On recent Google Pixel models from the Pixel 7 onwards, two eSIM profiles can be active at the same time if the operator supports it, so you do not need to delete your home eSIM.

According to Apple, your iPhone must not be locked to a network if you want to use it with another provider's eSIM abroad. If your phone is locked, ask your provider under which conditions it will unlock it.

How do you install and activate the eSIM?

Install the eSIM at home a day or two before you leave. According to Apple, setup needs a Wi-Fi or hotspot connection, and problems are easier to sort out while you still have a good connection. Your provider activates the eSIM by QR code or app; keep these details until it works.

On Android phones from other manufacturers, menu names can differ. If you cannot find a setting, check the manufacturer's instructions.

What happens to your number and your home SIM charges?

At your destination, you can use only the travel eSIM or keep both lines on. With both active, mobile data runs over the travel eSIM and your usual number stays reachable. Apple points out, however, that roaming charges may still apply to your home eSIM. Ask your provider in advance what incoming calls and texts cost at your destination.

If you use only the travel eSIM, FaceTime and iMessage keep working with your home number, according to Apple, and internet calling and messaging apps run over mobile data. Text-message codes from your bank still go to your home number. How to prepare such logins is covered in Before a trip: prepare digital access and backup options.

On ships and planes

On ships and planes, your phone may connect via a satellite service. According to Your Europe, EU roaming rules do not apply to these services and there are no price caps. While you are connected to a land-based network, for example in a harbour or at an airport, you should not pay extra. On board, the portal advises turning off roaming or switching on flight mode.

What should you do when you get home?

From iOS 26, depending on the country, your iPhone turns off the travel eSIM and turns your home SIM back on automatically, according to Apple. If you see no notification, go to Settings, check that “Turn On this Line” is enabled for your main eSIM, and turn off any travel eSIM lines you no longer need.

Before deleting a travel eSIM, check the provider's terms to see whether you can top it up for a later trip. On a Pixel, you delete it under Settings › Network and Internet › Mobile network with “Erase eSIM”.