Can Windows phone save Nokia?
5 September 2012 Last updated at 11:17 BST
Nokia and Microsoft are to co-host a press event in New York where they are expected to unveil devices running the new Windows Phone 8 operating system.
It is a critical event for Nokia after it surrendered its 14-year position as the world's biggest phone-maker to Samsung in April.
Mark Gregory reports.
Pictures of iPhone mock-up courtesy www.theverge.com