TORONTO (AP) — BlackBerry-maker Research In Motion, which is already struggling with plunging sales, said Thursday 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.

The Canadian company did add to its cash position as it prepares to launch new smartphones on Jan. 30 that are deemed critical to the company’s survival. RIM’s stock initially jumped more than 8 percent in after-hours trading on that news, but then fell $1.48, or 10.4 percent, to $12.65 after RIM said on a conference call that it won’t generate as much revenue from telecommunications carriers once it releases the new BlackBerry 10 platform.