With tens of thousands of phones being snatched annually in London, police are struggling to catch the thieves who use e-bikes and mopeds to help drive a vast criminal operation. But where do these devices actually go once they vanish from the streets? We tracked a stolen phone to China, part of what police describe as a global trafficking network. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For breaking news, video, audio and in-depth coverage: https://www.cbc.ca/news