The heavily backed Isis mobile payment system is set to take on Google Wallet this summer and will be available to 100 Million U.S. cardholders. Chase, Capital One and Barclaycard have all signed on with Isis to enable their credit, debit and prepaid cards to be placed into the Isis Mobile Wallet. Isis is a joint venture created by AT&T, T-Mobile and Verizon Wireless and is the reason why Google Wallet was blocked on the Verizon Galaxy Nexus (which is anti-competitive IMO but we have a fix for that).