Have you paid your bill in full and if it was overdue, was it a recent payment?
If so it will take a couple of days to return full service.
You can borrow a phone, use a landline or SKYPE to contact O2.
Numbers here Guide: Coronavirus Community Help and Support
Advice from an O2 Guru regarding a way to get through:
When you call, you will be asked for 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 an advisor.
Press Upgrade, Lost/Stolen or Fraud if you have to.
8am is the best time to call
*The Game Is On*
Track usage, upgrade and get support with the My O2 appDownload My O2