Sprint is quietly testing a new $60 unlimited data service as the company continues to fend off T-Mobile's advances. A Reddit thread (hat tip: Fierce Wireless) noted that Sprint is advertising an option in Milwaukee and Boston that provides a primary line with unlimited talk, text and data for $60 a month, a second line for $40 a month and each additional line for $25 each. A different trial being run in Oklahoma and parts of Arizona charges $50 each per month for the two lines and $25 per month for each additional line.

"We do trials all the time," Sprint tells Fierce Wireless in a statement. "We're in the market with a number of different things at any given point in time. As a matter of practice we don't comment on those trials."