My friend has a 3G iPhone, here is the deal, he accidentally upgraded through iTunes to 2.2 with firmware 2.28, so of course now he can't use it with Turbosim, so he gave it to his sister, but she has AT&T service, when she puts her AT&T sim card in, ithe iPhone does not recognize it. It says NO SIM. Is there a way to fix this? She has AT&T regular postpaid account, but it will not work, please help!