Sprint could definitely use a boost these days, and it’s apparently hoping to get that from upcoming expansion of its Sprint 4G services. For those who haven’t followed this epic sequence of events, Sprint 4G is the new tagline for its WiMAX services, which went by “XOHM” for, oh, a day or two. After linking up with Clearwire, however, it ditched the inexplicable moniker and went with something entirely more digestible — and now, the circle of explanation is complete.At any rate, Sprint 4G is currently only