3G is a seperate peice of hardware using a diffrent frequency, if the FCC documents do not include 3G, the iphone simply does NOT have 3G, GPRS and EDGE work off your exsisting connection, this is why you cant connect to the internet and talk at the same time.
iphone 2.0 must be FCC approved for the 3G radio before apple can sell it, the FCC documents also must be public.
EDGE is like dialup, you cannot talk on your phone and have edge going
3G is litterally highspeed, you can talk and surf at the same time
big diffrence, its too bad apple didnt have at least UMTS, if they did, they would only be 1 generation behind, but with 2.75G (edge) they are 2 generations behind and going onto 3 because 4G is just around the corner