Since Google Wallet launched on Sprint, the only major U.S. carrier not involved in the Isis mobile wallet venture, rival carriers have resisted putting Google's payment system on their phones. Verizon Wireless in particular has been the focus of media criticism and, most recently, has been holding its ground against an FCC inquiry as well.

Verizon's argument has always boiled down to security, and Google has certainly faced security concerns over its mobile wallet. Early last year, a research firm highlighted two ways to get at the funds in the Google Wallet stored-value account.

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