I've had a lg Thrive for about 3 weeks now and it has been the biggest headache. It works fine if I'm doing anything but making or receiving a call while the sd card is inserted. I can surf, text, games, all of it works fine but the phone shuts off a few seconds into any call. If I remove the sd card then calls are fine, no problems. I've tried 3 micro sd cards; 4, 16, and 32 gb they all affect the phone in the same way. I tried formatting the 32 gb from my computer (fat 32) and the problem remains the same. I tried removing all downloaded apps, no success. After shutting off it takes it about a full minute to reboot. Can anyone help, this is driving me crazy. btw I'm using straight talk as carrier over At&t.