I agree that it seems unlikely to be the SIM but you have to try it to rule it out. A hard reset may be required. This will delete all info off the phone so back up your photos, videos etc first.
Step 1
Ensure that the handset is turned off by holding down the power button until your phone switches off.
Step 2
Press and hold the volume down key, and tap the power button briefly. Continue to hold the volume down key until you see a exclamation mark on the screen.
Step 3
Push the following keys in order:
Volume up
Volume down
Power
Volume down
Step 4
Your phone will reset itself to factory settings. Two cogs will be shown during this process, it may take some time to complete.
Your phone will restart and the interactive set-up process will begin, as if setting up a new phone.
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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