T-Mobile added 4.4 million customers in 2013 . Its `` UnCarrier '' approach targets customers of other carriers . Company still lost money , though : $ 20 million last quarter . That reflects the money T-Mobile is spending to attract new users and expand its network , as well as some of the less-expensive plans it 's offering to lure all those new customers . Comment:
T-Mobile added 4.4 million customers in 2013 . Its `` UnCarrier '' approach targets customers of other carriers . Company still lost money , though : $ 20 million last quarter . Comment: