Hello, my samsung galaxy s2 at&t sgh i777 has no signal for some reason. I've switched sim card with another phone and it works, so it must be the phone. It was doing just fine for a few weeks, then all of a sudden no signal. I've factory resetted, it works for a few calls, then no signal now for the whole day. Do you guys know what to do?
Sometimes it shows that i have a bars of connectivity, but when i call, no ring tone, when i try to send text messages, it sends for so long and comes back saying unable to send message.