Cell carriers to roll out "mobile wallets" in Utah BRIAN SKOLOFF,Associated Press SALT LAKE CITY (AP) — A joint venture between three of the nation's four largest cell phone carriers will soon offer the United States' first commercially available mobile fare payment program to a public transportation system. Isis, a mobile commerce joint venture between AT&T Mobility, T-Mobile USA and Verizon Wireless, announced Tuesday it will roll out the pilot program in Salt Lake City in 2012, offering an alternative to credit and debit cards for Utah Transit Authority fare payments. The program is also set to work for point-of-sale purchases at retailers in the area.