Apple has released a new version of iOS, 7.0.4, which addresses a bug causing some FaceTime calls to fail.
The update for iPhone, iPad and iPod Touch devices fixes a security issue with the App Store that enabled a user to complete an app or in-app purchase without full authorization.
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Owners of older iPods not eligible for the 7.0.4 upgrade have received an upgrade, too: iOS 6.1.5. This also fixes the aforementioned FaceTime bug.