as said above, you can swith
GSM phones. The one thing that people dont think about is... if you get another phone, whether it is another cingular phone, or a new(unbranded) phone... you need to take it to cingular so they can put your
IMEI number in the system for insurance purposes. Your phone will work without doing this, but if you ever lose/damage your phone, cingular will replace the phone that is attatched to your account.