LAS VEGAS (Reuters) - Nokia's N810 mobile Internet tablet will be one of the first devices designed for a new high-speed wireless network that Sprint Nextel Corp will launch commercially in April.

Nokia on Tuesday unveiled a version of the handheld device, which has a 4.13-inch touch screen, for WiMax -- the emerging wireless technology that Sprint is betting on for its next generation of high-speed services.

WiMax promises to blanket cities with mobile Web links that are five times faster than today's speeds. Like the first N810, which went on sale in the fall, the new version will also work on Wi-Fi, a short-range wireless technology used in hotspots such in coffee shops.