can i use a cingular go phone sim card in a non-go phone

Hi yes you can use your cingular sim in non go phone only if it is unlocked one .Else if the phone is locked to some other network provider then until you unlock it you can't use it with cingular.You can easily unlock your phone using sites like Unlocking4Free.com here they will generate network unlock code for some older mobile models at free of cost .After unlocking the phone you can freely use it with any GSM sim ...