In this Jan. 17, 2014 file photo, Apple CEO Tim Cook, right, and China Mobile's chairman Xi Guohua are silhouetted against a screen showing iPhone products as they applaud during a promotional event that marks the opening day of sales of China Mobile's 4G iPhone 5s and iPhone 5c at a shop of the world's largest mobile phone operator in Beijing, China. The high-stakes battle between the world's largest smartphone makers is scheduled to wrap up this week after a monthlong trial that has pulled the curtain back on just how very cutthroat the competition is between Apple and Samsung. Closing arguments in the patent-infringement case are scheduled to begin Monday, April 28 with the two tech giants accusing each other, once again, of ripping off designs and features. At stake: $2 billion if Samsung loses, a few hundred million if Apple loses. (AP Photo/Alexander F. Yuan, File)