Linda Yueh starts mobile twisting machine
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Rare access to a mobile phone quality-testing lab

26 March 2014 Last updated at 15:21 GMT

BBC chief business correspondent Linda Yueh has been granted rare access to the mobile manufacturer ZTE's quality testing lab in Shenzhen, China.

This is where the firm - the world's fifth biggest handset maker by volume - conducts various stress tests on its designs.

ZTE was granted 16,000 patents last year - but, as Linda reports, those ideas must survive in the real world and that includes twisting and dropping.