If you are on AT&T ...
The people at the AT&T store INSIDE the Smith Haven Mall are the best I have encountered.
When it comes to getting people in and out and knowing whats in stock as well as switching upgrades between lines on a family plan they have it nailed down.
Best example is when the 3s came out. The store manager was there at the crack of dawn, walked the line people and made a list himself of who was getting what and showing people how to check their upgrade availabilty etc all before people even got into the store.
Im going to give credit where it is due... I am a customer who wants what he wants without excuses so that's why I am taking the time to give them the praise here.