i wanna buy an iPhone and was wondering if it's worth to unlock in and use it in the u.s., as i heard that the unlocked one losts some features. plus i'm bad with computer and stuff. i also read some threads other places that the plan including call and internet from other carriers are not much cheaper than att. is there anyone in the u.s. using iPhone and find the fee really cheaper? p.s. im in ny, the tax and fee is really crazy...thanks a lot!