I've got a new bug that's been a problem recently. At least a couple times a week I'll go to use my phone and the sim card isn't working correctly. The icon shows up as if the carrier shut the service off, but that's not the issue. If I pull the sim card and reinsert it it will sometimes fix the problem, but restarting the phone fixes it 100% of the time. Anyone know if this is a phone problem or a carrier problem?