O2

So I've done the form to change my number. Basically bring my PAYG giff gaff number to my O2 contract. My signal has gone off my giff gaff SIM now so does that mean it's in the process as my O2 contract still has the number on the SIM that it came wi...

Ive just got my first contract with o2 but I would like to keep my old payg number. could someone help me how to do it please