Sprint on Wednesday announced 10 new markets for its 4G WiMAX service. By year's end, the mobile provider expects to roll out the service to Atlanta, Charlotte, Chicago, Dallas, Forth Worth, Honolulu, Las Vegas, Philadelphia, Portland, and Seattle. Next year, that will also expand to Boston, Houston, New York, San Francisco and Washington, D.C, Sprint said.

Sprint's WiMAX service is currently only available in Baltimore. The company launched it there -under the brand name Xohm - in October 2008. But when Sprint and Clearwire completed their merger two months later, the service was re-branded as "Clear."

In addition to WiMAX service, Sprint also plans to introduce new 4G devices over the next two years, including a single-mode 4G data card, embedded laptops, a small-office-home-office broadband modem and a tri-mode phone.