Are those of us who just recently purchased the new iphone 4 and still have over 16months left on the contract just basically screwed and stuck with old 3G technology for the next 2 years while others are getting 4G speeds? I heard from the att rep when i purchased the phone last week that the current iphone 4 is 4G network compatible and will be able to get receive the new speed without having to buy a completely new "iphone 4GS" or whatever they call the next release. he tells me all u will need is software update and u can run on 4G speeds. anyone have thoughts on this? or know if the current iphone4 really is compatible with 4G network?