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:
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 . 2013 saw T-Mobile offer no-contract plans , add iPhone and expand network .