Nope they are a CDMA company in case you don't understand what that is go here http://en.wikipedia.org/wiki/CDMA
Only GSM companies use sim cards like nextel,tmobile and cingular and to the other person not all prepaid phone use simcards all you need is a card that you buy with minutes on it,Here you go in case you want to know what GSM is
http://searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci213988,00.html
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