How to use your phone in Europe without a huge bill

Roaming bills are the classic travel shock. A few days of maps, photos and messages on the wrong plan can cost more than the flight. The fix is simple: decide on one way to get data before you go, set your phone to use only that one, and check your usage. This guide compares your options, shows the settings for iPhone and Android and covers what to do when something goes wrong abroad.

Step 1: check that your phone will work

• Network support. Almost every phone sold in the US in recent years supports the networks used across Europe. Older phones can miss some bands, so check with your carrier.
• Unlocked or locked. A carrier-locked phone works with your carrier's roaming plan, but it will not accept a local or travel SIM.
• eSIM support. Newer iPhones and many Samsung and Pixel phones can add a travel eSIM in minutes.

See how to check whether your phone is unlocked and how an eSIM works if you are not sure. Contact your carrier if the phone is still on a payment plan, because it may not be able to unlock it until it is paid off.

Step 2: choose how you will get data

As a rough rule, use the carrier plan for trips of a few days or if you want things to just work, a travel eSIM for a week or more, and a local SIM if you will stay for weeks or live there. If you are still shopping, how to lower your phone bill covers plans that include international use.

Step 3: set up your phone before you leave

Step 4: the right settings when you land

How to avoid roaming charges

• Turn off data roaming on your home SIM unless your plan covers Europe, or switch it off completely if you use a travel eSIM.
• Turn off automatic app updates, photo uploads and background refresh on mobile data.
• Keep an eye on your usage on your phone and in the carrier app.

The steps for tracking usage are in how to check data usage on iPhone. Keep Airplane Mode on for flights and ferries, because some ships and planes offer mobile service at very high prices. A boat near a border can also latch onto a foreign network, so check which network your phone shows.

Calls and messages in Europe

With a data-only travel eSIM, you will not have a normal phone number for calls. Use WhatsApp, FaceTime or another app, and keep your home number on for texts and verification codes, with data roaming off. Wi-Fi calling and iMessage work over any Wi-Fi network. Banks and apps often send codes by text to your US number, so keep that line reachable. If you plan to buy a local SIM, tell your bank and move any critical two-factor logins to an authenticator app first.

Which countries count as Europe for your plan?

Carriers do not always define Europe the same way. A plan that covers Europe may include the countries of the European Union and the United Kingdom, but leave out places such as Switzerland, Turkey or the Balkans, or treat them as a separate zone with different prices. Cruise ships and ferries are usually excluded. Before you buy a pass or an eSIM, read the list of countries and check each place on your route, including layovers. A pass that works in France may not work on the train into Switzerland.

How much data will you actually use?

Light use means maps, messages and a few photos, and that fits in a small plan. Social media, video calls and music streaming use much more, and a hotspot for a laptop can use it all in a day. A simple way to estimate is to look at your own use at home. In Settings › Cellular on iPhone or Settings › Connections › Data usage on Samsung, check how much mobile data you use a month, divide by 30 and multiply by the days of your trip. Add some extra, then pick a plan with room to spare. Turn off video auto-play and download music and shows on Wi-Fi to stretch what you have.

Tethering is the other thing to check. Some travel eSIMs and day passes block or limit using your phone as a hotspot. If you need to work on a laptop, read the plan's rules first, and consider a plan that allows it. See how to fix an iPhone hotspot that is not working if sharing does not work on your phone.

What if you forgot to set it up?

After the trip: check your bill

Turn roaming off, switch your data back to your home line and remove or turn off the travel eSIM. Look at your next bill for international charges and compare them to what you expected. If something is wrong, contact your carrier quickly, because disputes are easier when the trip is fresh. Passes that charge per day can also bill days you did not intend to use, so check the dates. Take screenshots of your plan details before you leave and when you return.