@PAW1
You need a new sim as they are different.
See guide for the simple process change Guide: Migration & porting into O2
Switching from O2 Pay As You Go to Pay Monthly
If you switch from Pay As You Go to a Pay Monthly tariff, we will send you a new sim with a new phone number.
If you want to keep your original number, we can arrange this. You’ll need your new Pay Monthly phone number from your O2 confirmation email or sim pack.
- You can fill in our online form: Switch your number to Pay Monthly.
- Or call us on 202, free from your O2 phone, on 0344 809 0202 from any other phone, or visit an O2 store.
https://www.o2.co.uk/help/device-and-sim-support/how-to-keep-your-mobile-number
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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