Have you topped up by calling 4445 or signing In to My O2 or is the problem that no network is showing?
@Joshua wrote:
I've just brought a pay as you go sim for £10 and it's not working
If you bought it for £10 then if its a big bundle tariff, no credit will show as the money is taken for your allowances which you get every month by topping up £10.00
Good morning @Joshua, and welcome to the forum 
I was wondering if your SIM was now working, or if you still needed any help with it? There are some good suggestions above so it'd be fantastic if you could tell us whether it helped or what you've tried and what's not working!
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