I have T-Mobile and don't want to switch to AT&T. Can I purchase through Apple.com and unlock myself using ZiPhone or whatever? Or, will I be locked into AT&T the minute I place my order? How risky is using a unlocked iPhone? If I don't update unless given a clear green light from the creator of whatever software I used to unlock am I sure to keep it operational and not end up with it bricked? Does it do anything like silent updates, things like Windows would do? Or is it strictly user initiated? If bricking occurs is it more or less likely that I'll be able to unbrick it? Resources on the net are endless, I would love to find a trustworthy and straight forward FAQ for all this.