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SIMs and numbers

Help and support

SIMs and numbers

Learn about SIMs, and numbers related to your device

Activating and using your SIM

Get up and running in no time

eSIM

Everything you need to know

IMEI explained

About your device’s unique IMEI number

Unblock your phone

Here’s what you need to know

What's my phone number?

Easy ways to find out your phone number

Can't find what you're looking for?

My O2

Track your usage, check your bills, upgrade and more

Need help with your device?

Take a look at our useful self-help guide

O2 Community

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