After the unusual situation where iPhones suddenly gained free access to
Wi-Fi in certain AT&T-hosted hotspot locations, and were shortly
disabled, AT&T has finally resolved the situation.

The company recently posted on their iPhone webpage under the "Plans"
tab that all iPhone plans now include access to their "more than 17,000
Wi-Fi hotspots, including Starbucks all for use in the U.S."

You can get a list of all the hotspots that now have included iPhone
access at AT&T's website here, located under "plans".

AT&T has yet to actually make an official announcement on the new
service, but it would it would be safe to assume that they will be
shortly.