Transferring my old O2 Pay As You Go phone number to my new O2 Pay Monthly phone

[AGB]

I recently bought a new O2 Pay Monthly phone to replace my old O2 PAYG phone. At the time I was receiving a lot of robocalls calls in mandarin on my old phone. I tried blocking them but they just switched to another number. So I decided to change to a new number on my new phone. The unwanted calls have now stopped and I would really prefer to keep my old number. Is it possible to transfer my old number to my new phone? I still have both phones on contract.

[MI5]

@AGB 

If the number is still active you can.

Just call customer service to migrate your number to the new contract Guide: Coronavirus Community Help and Support