Originally Posted by repulsivestyler
I have already encountered this three times today.
I will try resetting the network settings though I dont think it is software related issue or maybe its just too early to reach a conclusion.
I was thinking of replacing the sim card if the problem still exist then obviously a restore will be needed.
Mine started doing the same exact thing a couple of days ago. In the end I did a fresh restore and got stuck at the activation screen in which I could not get passed. I did another restore with a cooked firmware to bypass activation, but it still would tell me either invalid sim or just no service.
So, fresh restore with official firmware may block you at activation screen and not let you go further. I have nothing else to provide cuzz I am still stuck trying to find another solution. Problem with mine is a factory lock I am told.