I'm assuming it's been working fine previously and you haven't changed anything?
Also, have you tried your sim in another phone?
If that's the case I'd suggest you get a new sim card and do a sim swap to keep your number and contract details.
Call CS and they will post you one out or go into a o2 shop.
If you get a sim in the post you'll need to call when it arrives to get the new sim activated and account swapped.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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