You can only change to your name when your contract is due for upgrade or renewal.
It isn't possible to just change the name mid term unfortunately.
This is because you need to pass the credit and identity checks which can only be done with a new contract.
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)