SIMs and numbers

Help and support

Learn about activating your SIM and downloading your eSIM to your phone

Get up and running in no time

Everything you need to know

About your device’s unique IMEI number

Here’s what you need to know

Can't find what you're looking for?

Track your usage, check your bills, upgrade and more

Take a look at our useful self-help guide

Head to our forum to ask questions and chat with other O2 customers