Clearwire Corporation (stylized as clearw˙re) is a wireless internet service provider (WISP) serving markets in the United States, Belgium, Spain, Denmark (with Danske Telecom), and Mexico (via MVSNet). Clearwire, founded by cellular phone pioneer Craig McCaw in October 2003 is headquartered in Kirkland, Washington.Clearwire uses a 4G wireless technology called WiMAX transmitted from cell sites over licensed spectrum of 2.5–2.6 GHz in the U.S. - Source: Wikipedia