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.