Sprint has announced its WiMAX 4G service is now available in three new markets, including Las Vegas, NV, Portland, OR, and Atlanta, GA. Sprint 4G delivers peak downlink speeds of more than 10Mbps and average downlink speeds of 3-6Mbps –three to five times faster than the 3G service offered by any carrier today, based on average download speeds.

“Sprint 4G is emerging as a high-value asset for businesses of all sizes,” said Carolyn Rehling, regional vice president, Sprint. “With our large head start in deploying 4G, Sprint will also take the lead in applying it to productivity-enhancing solutions for business. Sprint is prepared to leverage our 4G speeds and growing national coverage to help Atlanta area businesses and government agencies realize significant cost and marketing advantages for their operations.”

Additionally, Sprint plans to deploy 4G service in following cities by end of 2009: Chicago, Dallas, Ft. Worth, Philadelphia, Austin, Abilene, Amarillo, Boise, Bellingham, Charlotte, Corpus Christi, Greensboro, Honolulu, Killeen-Temple, Lubbock, Maui, Midland-Odessa, Raleigh, Salem, San Antonio, Seattle, Waco and Wichita Falls.

Sprint is offering USB Modem U300 for free after $50 mail-in rebate for use with laptops and the data plan is priced $69.99 for unlimited 4G data and 5GB of 3G data. You can get more information about the service on Sprint’s 4G website.