Yes. It has to be AT&T. I'm an ex employee of the company. Worked in a corporate retail store.
[doublepost=1474469927][/doublepost]
It should reset immediately if you are returning in store.
[doublepost=1474470088][/doublepost]
If it helps at all... if you are or have been leaning toward the plus... wait it out. I went with the regular 7, but had been planning on the 7+ since the keynote. This would be my first time with the plus model. When I couldn't get one, went with the regular 7. Now today, I am exchanging out for a plus. I feel badly for wasting a phone. I tried to convince myself to just stick with the 7 and talked myself into why it was a better decision for me... was wrong and wasted a phone in that.