DON'T DO IT!!!! I am in one of the lagest and most congested celluar cities in the world. New York City. TDMA = AT&T and CDMA = Verizon and Sprint. You have no Idea the horrors of being disconnected and not having calls come through that I went through while with ATT. TDMA sucks! It is not ATT it the technology that is bad. Sprint... Several of my friends have it and like it. I don't like their billing practices and disconnection system. I am very happy with my Verizon Phone. Don't leave your CDMA Carrier for TDMA. Either find another CDMA carrier of Switch Phones and companies to Nextel using iDen or Cingular and T•Mobile which are on GSM.