Last week, Starbucks and AT&T began their nationwide rollout of AT&T Wi-Fi access at Starbucks stores - with the surprise addition of free access to iPhone users with a valid AT&T Wireless phone number.

But the security isn't exactly high-tech... "There's a loophole that allows anyone to get free Wi-Fi if you switch your browser's user agent to Mobile Safari," according to Karl at BroadbandReports.

To clarify: "In Safari, you can select the iPhone user agent through the Develop menu (which you can enable by navigating to Preferences -> Advanced and checking 'Show Develop menu in menu bar,'" writes Lifehacker's Adam Pash.

"We can't imagine this is a hole that won't get plugged real fast, so get it while the gettin's good," advises Engadget's Joshua Topolsky...

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