In digital wallet business news, a new venture is in the works with AT&T Mobility, T-Mobile USE and Verizon Wireless to bring their technology to markets outside the U.S.

Spokesman Jaymee Johnson explains that the venture, called ISIS , has been discussing international opportunities.

ISIS has the goal of enabling consumers to use their phones for either credit card or debit card purchases in stores. They are in stiff competition with Google Inc. and other startups in the mobile payment field. According to Juniper Research, this is an incredibly hot and ever-growing field with a worldwide market that is expected to reach $670 billion by 2015.

During an interview, Johnson said, “The underlying equity partners in ISIS give us some degree of visibility and awareness beyond the U.S.”

ISIS, however, is a bit behind Google with their venture. While Google Wallet launched in September, ISIS only plans to start in two cities in mid-2012. ISIS has announced a few news items that show that support for them is growing. One of their technology providers in the U.S. will be Gemalto NV and they’ve announced agreements with payment networks Visa Inc. and handset makers such as Motorola Mobility Holdings Inc.