The new Apple iPhone 4 going to hit AT&T Stores June 24, Preorders Start June 15. If you have already an iPhone with AT&T contract then you can take advantage of AT&T iPhone 4 upgrade offer. Here is the simple process to check upgrade eligibility.
To check iPhone 4 upgrade eligibility, AT&T made it really easy for all its customers.
Just Dial *639# from your AT&T iPhone and after a moment you will receive a message from AT&T with iPhone 4 upgrade eligibility details