You can use this handy tool to:
- swap your current sim to a new sim
- swap your standard sim to a micro sim
What you'll need
Your O2 mobile phone so we can text you a code.
The sim serial number (SSN) of your new micro sim
What is an SSN?
Your SSN is a 19 digit number starting 894411. It's printed on your new sim
Find out more
What is a micro sim and why do I need one?
How to swap to a micro sim?
Your mobile number
We need to check your phone is yours. So put your number in the box below and we'll send you a code to enter on the next page. Your sim swap code is on its way, so please hang on. Give it about 30 mins.