BlackBerry tumbles as analysts rekindle turnaround doubts

TORONTO (Reuters) - Shares of BlackBerry slipped about 8 percent on Thursday as analysts questioned whether the handset maker's turnaround plan would succeed in the brutally competitive smartphone market. Discounting of the Z10, its recent handset meant to take on the likes of Apple Inc's iPhone and Samsung Electronics Co Ltd's Galaxy line, has also raised concerns, according to one trader. BlackBerry launched its latest handsets based on its much delayed BlackBerry 10 operating system in January, but they started selling in the United States only in March. ...

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