Isis, the mCommerce joint venture between US operators AT&T, T-Mobile and Verizon, is rolling out its mobile wallet across the country.

The wallet has been piloted in Austin, Texas and Salt Lake City, Utah, over the last nine months.

The wallet makes payments over NFC, and currently only works on Android handsets, though Isis promises support for iOS, Windows Phone and BB10 later this year. Given that NFC isnt available on iOS devices, it remains to be seen whether it will use a different technology or this is a hint that Apple might finally be introducing the technology to its next generation of iPhones.

“Over the past nine months, we have proven the power of an open platform, creating an ecosystem of literally hundreds of partners dedicated to making mobile commerce a reality,” said Michael Abbott, chief executive officer, Isis. “As part of our commitment to consumers, we are incorporating feedback from our pilots into the next generation of the Isis Mobile Wallet as we prepare for national availability later this year.”

During the pilots, Isis found that people on average used the wallet more than 10 times per month, and that two-thirds of active users opted in to receive offers and messages from brands.