Simple. Call sprint and ask for it. Just say you want to change your EVRC settings. If that rep wont tell you then hang up and call back. The next rep will. Then write it down cause it never changes.
Sprint LG G2 >> Current Owner >> Stock, Debloated, Rooted, TWRP'ed
Sprint HTC One >> Current Owner >> Stock, Unrooted (Till Kit Kat Comes)
Sprint Moto Photon >> Current Owner >> Rooted, Docked, Converted to XMBC & Android Media Box
TMO HTC G2 >> Past Owner >> Imo, The best Phone ever made design wise.