Legere was appointed CEO of T-Mobile US in September 2012, and has since been noted for T-Mobile's "Un-carrier" approach to contract-free wireless networks. He first worked in telecommunications at New England Telephone in 1980. Legere then spent nearly twenty years at
AT&T, where he spent some time working under
Daniel Hesse, formerly CEO of
Sprint Corporation. He was chief executive for
AT&T Asia from April 1994 to November 1997, and also spent time as head of AT&T Global Strategy and Business Development. From 1997 to 1998, he was president of the worldwide outsourcing subsidiary of AT&T, AT&T Solutions. Legere then worked as senior vice president of
Dell and president and chief operations officer for Dell's Operations in Europe, the Middle East and Africa and president, Asia-Pacific for Dell from 1998 to February 2000. Prior to joining T-Mobile US, he was CEO of Asia Global Crossing from February 2000 to January 2002, and CEO of
Global Crossing from October 2001 to October 2011 where he led the organization through bankruptcy and eventually an acquisition by
Level 3 Communications. He is on the
CTIA board of directors, and has been a director of the CTIA wireless internet caucus, since October 2012. He was a director of Global Crossing, from October 2001 to December 2003, and Sanrise Group and Asia Global Crossing, from April 2000 to March 2002. He was a director of
ON Semiconductor. Legere succeeded Jim Alling, and became CEO of T-Mobile USA, September 2012. Following the merger with Sprint being completed early, Legere officially resigned as CEO on April 1, 2020. He joined the board of Paradise Mobile as a strategic advisor in December 2024. ==Personal life==