Helsinki - Nokia (NASD: NOK) on Tuesday launched its rejiggered N-Gage mobile games service, as well as a mobile social network that lets users share photos and videos, Reuters reported. After several delays, the N-Game games platform was opened on Tuesday to owners of Nokia's N81 multimedia phones; a wider launch is expected later. The Share on Ovi social network was built with technology acquired from U.S.-based Twango, a Nokia spokesperson told Reuters.