Potentially. Cingular and TracFone both use GSM technology, but your Cingular phone is most likely locked. Put the SIM card in the Cingular phone and if it works, you are good to go. If you get an error message, you will need to have the phone "unlocked". You can find many unlocking providers on the web.
` No, unfortunatley, Trac fone sim cards can only be used in Trac fone phones. They do this for security purposes. Trac fone phones can be picked up for low prices at many electronic stores, and other various retailers. Any questions you have can be answered in a simple phone call to Trac fone representatives.
No you cannot. Tracfone sim cards only work in Tracfone phones. Unlocked phones work with other carrier sim cards but Tracfone sim cards require you to input a code.
Unfortunately you can not put the tracfone sim into the other phone. The reason why is because at&t/Cingular have made it where you are only capable of switching sim cards between at&t/Cingular phones only.