(Reuters) - Research In Motion shares tumbled more than 10 percent on Thursday after the company reported the first ever decline in its subscriber numbers and outlined plans to transform the way it charges for its BlackBerry services. RIM, which hopes to revive its fortunes and reinvent itself via the launch of a brand new line of BlackBerry 10 devices next month, caught investors off-guard on its quarterly conference call, when it said it plans to alter its service revenue model - a move that will pressure the high-margin business that accounts for about a third of RIM's sales. ...

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