The BlackBerry Z10 debuted quietly in the U.S. last Friday at AT&T, with Verizon Wireless and T-Mobile set to begin selling the device this week. AT&T stores reported none of the long lines that greeted glitzier launches such as the iPhone, but observers noted that BlackBerry's ambitions are more modest. The company is looking to target consumers who face more choices when it comes to business smartphones, as more firms embrace a bring-your-own-device policy that allows workers to use personal smartphones in the office.

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