A group of carriers, including AT&T, T-Mobile, and Verizon Wireless, in April of last year, originally hoping to have the service live in the first half of 2012. The group ran into issues that included security concerns, and later opted to leave credit-card operators to rather than the carriers themselves

When it rolls out next month, the Isis service will initially be available in Salt Lake City and Austin. In Salt Lake City, Isis partnered with Utah Transit Authority to process fare transactions, while Austin and will see the terminals at selected merchants around the city, according to Isis CEO Michael Abbott.

Tap-to-pay (or ) in mobile phones has recently begun to catch on. Competing service has begun to push its service heavily alongside its wireless partner Sprint, and carriers are releasing more and more devices with built-in NFC capability.

Even the upcoming " is said to have NFC capability, although AppleInsider said Tuesday that those rumors . Either way, mobile tap-to-pay is catching on.