I know th is is kind of odd but, i had the very same problem when i had my last phone. When i first received my phone i had a problem of the phone not receiving calls and not being able to phone call out. Not only that, when i am on the desk top it says that there is no sim card but, yet it put the stuff on my old phone on this phone. So, i took the back cover off once again and verified that the sim was in right and it was. Would i have to be re activated from the phone carrier? I thought you did not have to call the carrier if the sim card is already activated. It let me put in my g mail address but i can not receive or call out.