You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract QR Codes Are Alive and Well and Living in China Hot Mobile App WeChat Is Reviving the Codes, All But Dead in U.S., For China By Ad Age Staff, Published on January 13, 2014 6 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Become a Member Already a member? Log in.