BlackBerry Ltd Chief Executive John Chen fired a salvo at T-Mobile US Inc on Tuesday, calling ill-conceived a promotion run by the company that encourages customers using BlackBerry smartphones to upgrade to iPhones. T-Mobile US, which is majority owned by Deutsche Telekom AG, sent out emails to some of its customers last week, pitching them free iPhone 5s and touting the promotion as a "great offer for BlackBerry customers". That sparked a brouhaha in social media forums after some of the telecom company's loyal BlackBerry client base reacted angrily to the offer, which they perceived as a slight. The backlash prompted T-Mobile US Chief Executive John Legere to respond publicly.



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