I have had at&t service for about 10 years now. I have had multiple iphones including the 4 and 4s and all of them worked with two to three bars of 3g in the basement of my home (the 4s was labeled "4g"). I've had the Iphone 5 since Friday, and it gets a steady one bar (without the "3g" or "4g" symbols, whatever the "regular" service is). I cannot take calls in the basement anymore, the person on the other end cannot hear me. Any ideas or is anyone else experiencing a similar problem? Could the phone be defective?