I've had great service for almost two weeks and as of yesterday I cannot make/receive txt or calls and everytime I do I get "Mobile network not available".
I have done nothing to my phone and is still in mint condition.
try taking the sim and battery out and then putting it back in ?
Reception is perfect. I live in central London.
Have also tried taking SIM and battery out aka "the poor man's reset" but didn't fix the problem.
Do you have access to another sim to wack in the phone to test?
Where did you get the phone from?
the SGS2 hasn't been around very long and it's showing all the classic signs of being barred.
I hope I'm wrong but that's exactly what it'd do if the IMEI is blacklisted.