@Alan01 You're going to have to be a lot more specific than that, such as saying what kind of phone you have, how long you've had it, and what the problem actually is.
I DO NOT WORK FOR O2
202 from your O2 pay monthly mobile.
4445 from a PAYG mobile.
Other numbers here https://www.o2.co.uk/contactus
and here Guide: Coronavirus Community Help and Support
Track usage, upgrade and get support with the My O2 app