The biggest competitor to Google Wallet - and when I say biggest competitor I mean it's going to chew up Google Wallet and spit it out like a piece of bad meat - has just joined forces with American Express to have the three biggest credit card issuers already flipping the switch with its mobile payment platform. Isis, a joint venture between T-Mobile, AT&T, and Verizon, is steadily making its way to a nationwide launch.
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