My mom has a 32gb iPhone 5 that she got on release day. Yesterday she was using it and all of a sudden it lost AT&T network and said searching, then a picture of a man popped up. When she got home she showed me and it still didn't have network, but the picture wasn't present. I'm not sure if she was on a web page and that popped up or what. I restarted the phone by holding power+home and it seemed okay afterwards. Has anyone experienced anything like this? Is it anything to worry about?