Think of SK-EarthLink as the wireless carrier for the geek squad. When it launches later this year, it will target what [Earthlink founder Sky] Dayton calls "Internet-savvy early adopters" -- those consumers who will be the first to buy the latest 3G (third-generation) cell phones and will eagerly use data services via cell or Wi-Fi networks. The joint venture will build on EarthLink's well-deserved reputation as a company willing to try new technologies. It was one of the first ISPs to offer voice-over-Internet-protocol service to its 5.5 million customers and was also an early supporter of broadband. SK Telecom has a similar legacy: With 18 million subscribers, it was the world's first CDMA carrier to launch a 3G network, and it's a pioneer in GPS-based location services, as well as video applications for cell phones....

Here's the cool part, from an investor's point of view: SK-EarthLink will try to reach that goal without spending a dime developing its own infrastructure. Instead, the upstart carrier will rely on Sprint and Verizon Wireless to provide the backbone for its wireless offerings. SK-EarthLink will function as a mobile virtual network operator (MVNO), essentially renting access to each network. It will pay the carriers a per-minute fee each time one of its customers makes a phone call or streams a video broadcast. SK-EarthLink will also integrate Wi-Fi into its devices, drawing on Dayton's experiences at Boingo Wireless, the nation's largest Wi-Fi hotspot aggregator.