apple iphone? can it b unlocked?

i have known 4 yrs that most phones can be unlocked from their current carrier to b used on other cell networks. my ? is can u do the iphone 4 the same? i have tmobile and would love to have an iphone, but dont wanna switch carriers. i dont want at&t or verizon! will the iphone work with tmobile?
ok, now i know it can be done, does it still work the same. all the apps and itunes and video conferance. r there any probs w/unlocking it? i wanna know everything i can b4 i buy one and have it unlocked. will it still work the same as it does on at&t?
i mainly wanna know about the video convo part the most cause thats what interests me the most.
do u really have to dwnld one of the programs i have found just to unlock it? or is there another way and no one wants anyone to know?
 
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