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Blackberry Z10 U.S. release faces delays due to testing process

A BlackBerry 10 smartphone prototype was on display

Photo credit: Bloomberg News | A BlackBerry 10 smartphone prototype was on display late last year during a developer conference in Thailand. (Nov. 29, 2012)

BlackBerry’s latest phone faces a lengthy testing process by carriers in the United States, its biggest single market, further delaying the arrival of a product that was already more than a year late.

Verizon Wireless and AT&T Inc., the two largest U.S. wireless-service providers, have multistep tests that can take months to complete. The devices are checked for signal strength, battery...

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