You'll find the information under Making calls abroad
<>You'll know if international roaming is activated...>
You'll know if international roaming is activated because a message will appear saying you can make calls when you're abroad. If it's not activated, a message will appear saying you can't make calls when you're abroad.
If you want to change your international roaming settings while you're abroad, you'll need to register for and log into your My3 account on a computer. You can't access your My3 account on your phone when you're abroad, unless you’re in a Feel At Home destination.
If you want to change your international roaming settings before you go abroad, call 333 from your Three phone or 0333 338 1001(standard rates apply) . You can also call us from abroad on +44 7782 333 333. Keep your PIN handy when you call us, so we can take you through the setup as quickly as possible.
Checking your phone will work abroad.
It's important to make sure that your phone is compatible with the frequency of the networks in the country you're travelling to.
A tri-band or quad-band phone will work in almost any country. You can find out more details here.
If you're not sure which frequencies your phone supports, go to our device support and select the make and model of your phone. You'll find the frequencies your phone supports in Using your phone abroad.
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