My S3 after pressed power button turn on go straight to home screen. No prompt for SIM Card PIN number, thus no service. I went into security to enter PIN number to enable the service (and disabled the SIM Card PIN), so that it can connect to network. However it is annoying now that pressing power button either turn screen dark or power off. No more further function. This is second time in a week. Last time was recovered by factory reset. Anyone has any idea what is wrong?