No cash? No problem. A trip to Shenzhen, China highlights how the explosive growth of mobile payments is driving a wallet-free society. WSJ's Jason Bellini reports. Don’t miss a WSJ video, subscribe here: bit.ly/14Q81Xy More from the Wall Street Journal: Visit WSJ.com: www.wsj.com Visit the WSJ Video Center: wsj.com/video On Facebook: www.facebook.com/pg/wsj/videos/ On Twitter: twitter.com/WSJ On Snapchat: on.wsj.com/2ratjSM