Ti, Cingular most definitely does not use GSM! Their network is TDMA 800/1900. The only GSM service I know of in the US is Voicestream- it's easy to tell because their Nokias are all -90 models, as opposed to the -60s that most other providers use- AT&T, Verizon, Cingular. I thought Verizon and Sprint were the ones using CDMA 800/1900. Taka