My contract is up in December with ATT, meaning I can get a new phone for 199. I've,always waited for that. I have an unlimited plan so I'm not getting rid of that, but I want to buy 4.7 iPhone 6 in September if they come out then. Since I'm using the ATT network, my question: is there a benefit using an ATT Locked phone on the ATT network? If not, I'm going to buy, at full price, an unlocked phone and use it on my ATT account. Thoughts?