Priority

[Henryf19292]

Can't sign up when I put my number in it says there was a problem and we've been notified 

[MI5 · Accepted solution]

@Henryf19292 

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.

[Henryf19292]

Thank you, have you any idea why this happens...I just want to use priority 

[MI5]

Glitchy O2 systems @Henryf19292 

[Henryf19292]

It works when I try a different number, just not the number I actually need it on...topped up 10 quid and can't even use the service