[Q] Very bad service, not able to update, doesn't recognize other simcards
Something really weird is going on with my At&t galaxy s3. I'm new to this forum so I'll just explain what I'm experiencing and do my best to work through it will all of you. This phone got rooted by someone else and when I got it, the rooted program was in chinese and was acting all weird and wasn't getting good reception, although it was before it was rooted. I flashed it back to normal and it's acting very curious. It will receive an At&t simcard but the service bars will go from 1 bar to 4g to Edge to 1 bar all in a matter of 20 seconds or so and doesn't seem to work. It will occasionally work to send messages, make calls, but it seems like it can't ever receive calls. I checked and the IMEI number is still the same. Also, I had originally tried to unlock it to another carrier and when I put in different simcards (From other carriers such as verizon) the service bars don't show up, instead, all it shows is a cancel sign and doesn't ask for an activation code or anything. I'm honestly not sure what to do here, I thought I had broken the simcard reader and replaced that, but that made no difference. I'd greatly appreciate any help. Thanks!