How to avoid international roaming charges?

check if your device is set up to work abroad by texting ROAMING for free to 150

within the EU you can use your phone as you would at home, free of charge

to make sure your phone connects automatically to 4G when you're in the EU, check your device is set to automatic network selection within your device settings. For help with this select your phone on our Phones and Devices Help pages and select Connectivity > Selecting Network

you’ll be charged a standard rate to use your phone outside of the EU. To access data, turn on data roaming in your device settings