Digital device theft is a big problem. I’ve seen numerous stories about iPhones being stolen right from a person’s hand while the user was talking on it. Others have reported sitting in a coffee shop while having a conversation and having someone walk in, see the person’s iPad, swipe it, and before anyone can get out of their chair, be halfway down the block.
http://robertsiciliano.com/blog/2013/11/21/prepare-now-for-device-and-data-theft/