Could be any number of reasons:
- WiFi connection not strong enough
- Software update removed it
- o2 system glitch
Try turning your phone off and on again.
If that doesn't work, try manually selecting a different network, once it fails select o2 (or automatic) again and then turn phone off and on.
If those don't work, then call o2 and ask them.
Please note, this is not customer services and we cannot access your account. Do not publish personal details (email, phone number, bank account).
Link to our guide on how to contact them can be found here
