The building I work in has many dead spots. When I walk back into a normal signal area it constantly will say No Service and I have to go toggle airplane mode. Ive tried restoring the phone(not as new though). Also got a new sim. Ive tried resetting network settings also. This is a replacement phone I got from Apple three weeks ago when my origional iPhone 5 screen started to die. Any help would be appreciated. EDIT. I just realized this is probably in the wrong forum. Sorry guys.