if i buy a ampd mobile phone then can i use it for cingular?
No, it will NOT work. Amp'd Mobile's phones are MVNO, which piggybacks off of Verizon's CDMA EV-DO network in the US or Telus Mobility's CDMA EV-DO network in Canada. CDMA does not use sim cards. Cingular's phones and network are GSM, which require a sim card in order to work. They are two completely different technologies and are not compatible with each other.
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No, Ampd Mobile phones run on CDMA technology. Ampd piggy backs on the Verizon network. Cingular and T-Mobile are GSM, what most of the world uses. They have the little SIM card behind the battery which you can take out and switch phones easily.
