Porting my number from sky to O2

[Samkma]

Just got my O2 sim, I did give my pac code while ordering got no confirmation about moving my number. Do I have to fill out any more forms?

[MI5]

You'll need to call customer service.
Numbers here Guide: Coronavirus Community Help and Support 
When it comes to the reason you are calling stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone.
Say "Upgrade", "Lost/Stolen" or "Fraud" if you have to, to get put through to someone.
8.00am is the best time to call if you can.

Or forms to fill in on this guide Guide: Migration & porting into O2  

[Samkma]

The request could not be completed, the following reason is given for the rejection:

Business Exception: The Mobile Number is not registered to the PAC provided. Please check and resubmit your request.

[Samkma]

Got above reply by email after I filled out the form.

[MI5 · Accepted solution]

@Samkma 

The PAC must match the number you are keeping.

Probably easiest to call O2 to register it as they can check whilst you are on the call with them.