From what I have been told by several AT&T reps...you have 30-days from the day you purchased your initial device. And...some stores will not allow you to do more than one exchange...although I hear that some on this forum have done multiple exchanges in an attempt to find the "perfect" 8300.
I am very happy to say that I bought mine over the phone from AT&T Business Services...it is made in Mexico, and not Canada...and I can't even exchange it in a store if I wanted to. But even with all those strikes against it...it is perfect in construction (no creaks or looseness at all) and in performance.
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