Welcome to the o2 Community forum.
Check out this guide..Read through carefully
Contact customer services
we are all customers here so do not have any access to accounts.
I expect you will need to contact customer services as you know this is a customer Community so we don't have access to accounts.
If you haven't got a phone or no access to one use Skype
These are contacts for o2
The PUK is valid for the sim card, not the phone, so it does not matter what phone it shows as long as the sim is the same.
Or, do you mean you need a PAC?
If so, how to get PUK here Guide: How to get your PAC [June 2021 Update]
Or finally, do you want to unlock your phone from the O2 network?
First check if it is locked with another network sim and if so, follow the guide here Guide: Unlocking an O2 phone to use a different SIM card
You can enter your phones IMEI manually if the default settings are incorrect.
Good news 😁
Track usage, upgrade and get support with the My O2 appDownload My O2