Customers of U.K. mobile network operator O2 may believe that photos taken with their mobile phones and sent via MMS to friends are private. But if the recipient's phone isn't capable of receiving MMS data, as is the case with Apple's iPhone 3G, those pictures may be publicly accessible. O2's security for this scenario is security through obscurity: It makes pictures sent via MMS viewable on non-MMS devices by posting them online with a URL that's difficult to guess. (source: informationweek.com)
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