Sprint is gearing up to launch its first Windows Phone 7 device on March 20, the HTC Arrive, Sprint announced. You may also see this one referred to as the HTC 7 Pro, which is how it's referred to globally. The HTC Arrive will run $200 after a $100 mail-in-rebate and obligatory 2-year service agreement or eligible upgrade.

Sprint today added a a few more markets to its 4G service umbrella, including Denver (as well as other cities along Colorado's Front Range, such as Boulder, Fort Collins, and Greeley) and Bridgeport, Connecticut, the wireless telco announced.

"Sprint is the leader in providing 4G service, and we're proud to extend our advanced mobile broadband network to two more cities today," said Matt Carter, president, Sprint 4G. "Sprint is the first national wireless carrier to make 4G a reality for our customers, and now Sprint's 4G is available in 70 markets across the country."

Those markets include coverage in 26 states, the District of Columbia, and several major metropolitan areas, some of which include Los Angeles, Atlanta, Las Vegas, Boston, Nashville, Salt Lake City, and more.

Sprint says its 4G service peaks at more than 10Mb/s compared to up to 3.1Mb/s for 3G, offering downloading speeds at up to 3-6Mp/s versus 600Kb/s-1.4Mb/s.

"Customers can use video chat on their HTC Evo 4G, and families traveling for the holidays can power up the Overdrive 3G/4G Mobile Hotspot to share 4G speeds with up to five Wi-Fi enabled devices -- such as an iPad, laptop, iPod touch, or game console -- making downloads, streaming video, and Web browsing fast and easy," Sprint said.

Sprint offers a pair of 4G Mobile Broadband plans, including a $50/month 4G-only option and a $60/month 4G/3G combo option. Both plans boast unlimited 4G usage.

Sprint on Monday rolled out its 4G service in a handful of new markets, including Los Angeles, Miami, Washington D.C., Cleveland, Cincinnati, and Columbus, Ohio. That brings the total count to 68 markets across the country, with plans to launch 4G service in San Francisco on December 28, 2010.

"We have witnessed a great demand from our customers for 4G speeds, power, and capabilities in these cities already and today they officially have it," said Matt Carter, president, Sprint 4G. "We are proud to deliver on our commitment to serve our customers and deliver 4G to more major metropolitan areas in 2010."

Sprint's 4G service (6Mbps) offers up to 10 times faster Web browsing compared to 3G (600kbps - 1.7Mbps), which comes as a boon for things like streaming video and music.