iphone 4 and tmobile??????????

hi, im thinking about getting a new iphone 4 and i recently found out that the sim card is totally different and can only be purchased from at&t. my dad wont get at&t for me because everyone says the coverage is really bad. he uses tmobile and wants me to use it to, so can i get a tmobile sim and cut it to work with the iphone 4? thnx
 
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