OK, my friend did something to his iPhone, and he has no idea how to fix it. It has a cracked screen, but that's not the problem. He didn't have a SIM card, but he could still listen to music, download apps, browse on wi-fi, etc.. He did something, I'm not sure what, but now when you un-lock it, it says to put in a SIM card. When you slide it, it shows the dial pad and says "Emergency Call" His iPhone was jailbroken, but I think he may have restored it. Is this why it is doing this? Thanks for the help. P.S I think it is a 1st gen but IDK how to tell. --Sorry for my lack of iPhone knowledge.