Softcard recently expanded to Microsoft's Windows Phone platform. Softcard, formerly Isis, is a mobile payment service backed by AT&T, T-Mobile, and Verizon Wireless. Windows Phone owners can associate a credit card from select financial institutions with Softcard on their phone and use it for mobile payments. According to Softcard, its app is accepted at more than 200,000 retail locations around the U.S. Softcard is free to download from the Windows Phone Store, but it requires a secure SIM card from AT&T, T-Mobile, or Verizon Wireless in order to function properly.


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