FILE - In this Sept. 25, 2012 file photo, Thorsten Heins, President and CEO of Research in Motion, gestures while talking about the messenger capabilities of the new BlackBerry 10 at

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FILE - In this Sept. 25, 2012 file photo, Thorsten Heins, President and CEO of Research in Motion, gestures while talking about the messenger capabilities of the new BlackBerry 10 at the BlackBerry Jam Americas conference in San Jose, Calif. BlackBerry-maker Research In Motion, which is already struggling with plunging sales, on Thursday, Dec. 20, 2012 said it lost subscribers for the first time in the latest quarter, as the global number of BlackBerry users dipped to 79 million and the stock plunged in after hours after the company said it will change the way it shares revenue with carriers. (AP Photo/Eric Risberg, File) less