I'm going to be selling my extra iPhone. Should I unlock it before selling, to make more $$$? Question though, I won't have anyway to test the unlock with ZiPhone. Will it be pretty straightforward, and I'll know, if it was indeed unlocked? Once it is, all they'll have to do is put in sim card from T-Mobile or whatever, and it will work? They don't have to connect it to ziphone themselves or anything? If that is the case, I guess putting in my AT&T sim from my phone, for a few minutes, if it lets it be used would be another good test huh, since iPhones normally require iTunes to activate? Thanks.