U. S. Cellular has turned on its high-speed mobile network in Bend and the surrounding communities, the company announced Friday.The Chicago-based company, which has 4.9 million customers in 23 states, is the latest to roll out 4G Long Term Evolution in Central Oregon. The service, which provides faster Web browsing and video streaming on smartphones and tablets, is available in Bend, Redmond, Alfalfa, Powell Butte, Terrebonne, Tumalo and at several destination resorts in the region, according to a news release.