I bought the samsung galaxy s2, and ive had a couple of problems. One that started today, was after i charged it to 100% the phone vibrated to let me know that it had fully charged, but a couple seconds later, i had a notification to say sim card was not inserted. I have checked with my old phone to see if it was a problem with the sim card, but it worked fine ,so it must be the handset. Does anyone know why this is and how i can fix this problem. ive tried turning the phone off for an hour but no luck