I got Sprint Premier just by paying my bill on time 3 months in a row. I also lost it paying late once.. And,. well you guessed it, got it back paying on time 3 months in a row again
-CC
P.S. Funny thing is that this time I am on SERO Prem 500 the $40/m plan +$10 Premium Data < $69.99.. I am not complaining! <3 Sprint