IPhone 3GS is showing no service

My iPhone 3GS is showing no service, I have reset the network settings but that didn't seem to work. I then restored the phone iteself but it still shows no service.
The phone is on O2 and I have tried a few other sims, but it still doesnt seem to work. The iOS is 6.1.3, I have been told this may be the problem but it was working a couple of days ago.
I was also told to try these steps which didn't seem to work:
1. Disable 3G in Settings/General/Network
2. Power off the iPhone by holding the top lock button down then sliding to power off, leave the phone off for 30 seconds
3. Power on the iPhone
4. Reset network settings in Settings/General/Reset
5. Turn on 3G
6. You should be able to find the network now
I don't know what elese I can do, I would really appreciate anyones help, thanks.

Basic troubleshooting steps
Reset the iPhone by Holding both Power and Home Buttons together till Apple logo appears.
Restore to a backup.
Backup, Restore in iTunes setup as new.

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