T$-$Mobile US$,$ Inc. $($TMUS$)$ is one of the largest digital wireless service providers in the United States. In a recent year, it had $102\mathrm{.}1$ million subscribers $($accounts$)$ that generated service revenue of $$50,395$ million. Costs and expenses for the year were as follows $($in millions$)$:

$\backslash$table$[[$Cost of revenue,$$11,878$