Clearwire’s WiMAX service has been a lumbering giant for well over a year now, as what started out at a few WiMAX hotspots in a few random cities has now grown into a service that’s available to a variety of locations across the country. We’re still a long, long ways out from having a truly nationwide 4G mobile data network, but the engineers at Clear are doing their best to expand as quickly as possible.In a release issued today, Clearwire Communications has announced the official launch day of CLEAR 4G service