Simple, buy all your phones at full price. Don't ask for a subsidized phone and have the ability to walk whenever you want.
No they still lock you, there is no contract for iPhone without signing a two year. AT&T kicked off all prepaid iPhones so unless this has changed? Please correct me if I'm wrong?
Save this crap, will you?
You're not getting much out of a bigger screen, except a device that's harder to hold. There's a reason Apple went with the retina display.
Bigger screens ≠ better.
Seriously, 3.5" is so perfect. People can actually use their phone with one hand.
3.5" will be the perfect screen size until Apple will build a phone with a bigger screen size. Then all Apple fanatics will love it.
Save this crap, will you?