@FIONA101
You'll need to start a new SIM only plan now.
You may still be able to keep your old number though.
Guide here Guide: Migration & porting into O2
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.Currently using:
Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)