After getting a job (finally), I decided to get my old LG G3 reactivated (Running Marshmallow 6.0). Only problem though is that, AT&T is trash and need to sort their stuff. And they removed my SIM card. Which wasn't an issue. until I returned home and turned the phone back on where now the popup that says "Unfortunately, the process com.android.phone has stopped." Pops up. Every two seconds. Literally. Its preventing any normal use of the phone, texting is a nightmare and it even messes with the Power Off menu. I'll go to turn it off and if I'm a split second too slow the popup will come up and I'll have to try again. Anyone who can help with this please do. I'd ask AT&T but as I said, not the best company. Refuse to help me until I pay a bill that I know for a fact was already paid. I just need to find the receipt.