Recently when i've been outside for a while with the phone it will lose all connectivity and can't get it back no mater what i do. If i do a simulated battery pull it comes back. THat is the only thing that works. There is no 3g/4g icon and the signal bars have the red x as if i'm in a no service area. Until today i'd never seen it happen when i hadn't been in a no service area and then come back in, but this morning after snowblowing it was lost and i have a very strong signal at my house. Could this be the sim card?