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I don't see where it says "unavailable," but I also don't get buttons to actually BUY a phone on the iPhone page (via the store).
 
The status that says "Ships In", it says currently unavailable.
 
FWIW, the AT&T online store still has them.

I know that AT&T has them, but it is probably because they purchased a lot and have a reserve. AT&T in my area has never run out of iPhones, Apple is the best gauge on what is happening since they would have the best control over inventory in my opinion.
 
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