Clearwire Corporation (stylized as "clearw?re" in the logo) is a wireless internet service provider (WISP) serving markets in the United States, Ireland, Belgium, Spain, Denmark (with Danske Telecom), and Mexico (via MVSNet). Clearwire was founded by cellular phone pioneer Craig McCaw in October 2003 and headquartered in Kirkland, Washington. Clearwire uses wireless technology, dubbed pre-WiMax, transmitted from cell sites over licensed spectrum of 2.5–2.6 GHz in the U.S. and 3.5 GHz in Europe.
On May 7, 2008, Clearwire and Sprint Nextel's wireless broadband unit Xohm announced their intent to merge, combining Sprint's 4G WiMax network (Xohm) with Clearwire's existing pre-Wimax broadband network. Sprint will own 51% of the firm, with ex-Clearwire shareholders owning 27% — a consortium of Comcast, Time Warner Cable, Intel, Google, and Bright House Networks will invest $3.2 billion and own the balance. Clearwire and the cable companies will buy 3G mobile broadband from Sprint as MVNOs. Clearwire/Sprint Nextel officially launched Portland, Oregon as the first market using the new service. Now the company is being marketed under the name CLEAR, except in those markets where the Clearwire name has already been established. (However, it remains uncertain whether this new incarnation of Clearwire, controlled by Sprint, will still continue to offer the contractual conditions which have sparked class action lawsuits in the past.) Clearwire/CLEAR is now implementing WiMAX 802.16e networks in many markets, with the largest to date being the greater metropolitan Chicago market.