The agency won the brief after pitching against the incumbent, Grey, in December.
W&K will be responsible for creating an urban campaign for the global launch of Nokia's flagship stores, which it plans to open in 12 cities over the next three years. Current store locations include Moscow, Helsinki, Mexico City and New York.
Federico Barbieri, Nokia's senior retail marketing initiatives manager and Nike's former marketing manager, said the company was looking for "a strong creative idea that was applicable across different urban environments".
He added: "We are still working with Grey, but for this brief, we were looking to challenge ourselves with fresh thinking as well as creating a healthy competition between our roster of agencies.
"W&K grasped the Nokia brand in a very short time and has strong urban campaign credentials. Both of these make a very good starting point."
While at Nike, Barbieri worked with W&K on the launch of Nike Town.