T-Mobile and its prepaid brand MetroPCS ranked highest in their respective segments in customers' wireless purchase experiences, according to the latest report from J.D. Power.

The nation's No. 3 carrier finished with a score of 855 on a 1,000-point scale. AT&T followed at 839, followed by Verizon at 833 and Sprint at 819.

“The teams at T-Mobile and MetroPCS are completely customer-obsessed, and I’m thrilled that they’re recognized for it, again and again and again,” CEO John Legere said in a statement.

Cog Systems and Management Sciences Inc. this month received a contract to develop security systems for military mobile devices.

The companies said in a statement that battlefield medics currently transmit information to remote medical personnel over classified networks — and that declassifying that medical data can be time-consuming.

The contract, awarded by the Army and Defense Health Agency, seeks to develop a prototype multi-level solution to "send life-saving data from a classified mobile device while keeping the data unclassified from end to end."

Former T-Mobile executive Ed Chao was recently named CTO at PoLTE Corp.

Chao formerly served as the carrier's SVP of technology strategy and development. PoLTE, which develops location software and technologies, also announced the completion of a "multi-million-dollar" funding round.

"By leveraging existing LTE networks in conjunction with the Lite-Touch architecture, PoLTE has the ability to redefine the location space with the only persistent and ubiquitous location technology that can scale with accuracy and reliability," Chao said in a statement.