Nokia plans to unveil large-screen mobile handsets next month to revamp its Lumia smartphone lineup and challenge Samsung, Reuters reported today citing 'sources.' According to the report, Nokia has developed more than one new mobile device and is due to announce them at an event in New York in late September. Technology blogs have also said that Nokia plans to launch a tablet device.

Nokia officials did not provide any comment.

Nokia has fallen behind Samsung and Apple in smartphones. The company has bet its future in smartphones on Windows Phone software, but Windows' share in the market is still very limited, while Google's Android operating system and Apple's iOS together control over 90 percent.