AT&T has finally launched its free Wi-Fi access for iPhone users at all AT&T-branded hotspots in the U.S. The service will provide free high-speed Internet access to iPhone users at all AT&T hotspots, including those found at Starbucks. To access a hotspot, users must launch the Safari browser, enter their 10-digit phone number on the page provided, agree to the Acceptable Use policy, and tap continue. AT&T will then send the user a text message containing a link, which the user must then open in Safari, and tap a link on the page. The company notes that the link sent via SMS will be valid for 24 hours, and only at the location from which it was requested.