Sprint 4G service unproven By Mason Cohn, Producer March 26, 2010: 12:16 PM ET Posted in: 4G, 4G phone, AT&T, CTIA, EVO, HTC, HTC EVO, Las Vegas, Long Term Evolution, LTE, Michal Lev-Ram, S, Sprint, Sprint 4G, Sprint 4G service, T, Verizon, VZ, WiMAX
