Although it was discovered as a “feature” a week ago, it’s not official until AT&T says it is. And finally on Thursday the ability of iPhone users to use AT&T hotspots at their 17,000 locations was added to the details of the iPhone plan on AT&T website.  Then they removed it again.AT&T’s iPhone website (under ‘Plans’ tab) has been updated to reveal that each iPhone plan now includes access to their “more than 17,000 Wi-Fi hotspots, including Starbucks all for use in the U.S.”It was first