Sprint’s taking full advantage of the head start it has with 4G, having just announced plans to launch and market 4G technology in an additional 17 cities in the U.S. yet this year. The additional market will join the previously announced markets of Atlanta, Chicago, Dallas-Fort Worth, Honolulu, Las Vegas, Portland, Philadelphia, and Seattle. The new additions for 2009 include: Abilene, TexasAmarillo, TexasAustin, TexasBoise, IdahoBellingham, Wash.Charlotte, N.C.Corpus Christi, TexasGreensboro, N.C.Killeen-Temple,