My sim card crapped out totally...registered no service whe I knew I was in range. Luckily I was in town and close to an Apple store. They popped in a brandy new sim card and I'm good to go. Biggest irritation is that I wanted the 3G while on vacation in Maine and could find NO SERVICE in the WHOLE STATE which is ridiculous but it was probably just the little card in pre-total-failure mode. I paid 15 bucks largely to get service while away and got zip...nothing. Watch this issue...sim card failure should be discussed.