It appears that AT&T is offering free Wi-Fi usage for iPhone users at 71,000 AT&T hotspots, Barnes and Noble, and Starbucks stores. Instead of the usual login screen, users will be greeted by new screen prompting them to enter their phone number. Once the phone number is entered, one will be able to enjoy free Wi-Fi.
However the service is not yet available everywhere, but it should be soon.

Thanks: MacRumors
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