Days after Olli-Pekka Kallasvuo stepped down as Nokia's president and CEO, the company announced Monday that the head of its mobile unit is also resigning.

Anssi Vanjoki, who heads Nokia's mobile solutions unit, is required to provide six months notice and will continue in his role for the time being, Nokia said.

"I felt the time has come to seek new opportunities in my life," Vanjoki said. "At the same time, I am 100 percent committed to doing my best for Nokia until my very last working day. I am also really looking forward to this year's Nokia World and sharing news about exciting new devices and solutions."

According to biography on the Nokia's Web site, Vanjoki has only been in his current role since July 2010. He joined Nokia in 1991 as vice president of sales in the mobile phones unit and most recently served as the general manager of the Markets unit from January 2008 until being appointed head of mobile.

In a July blog post, Vanjoki said he was "committed, perhaps even obsessed, with getting Nokia back to being number one in high-end devices."

Prior to working at Nokia, Vanjoki held various role at 3M.

Nokia announced Friday that Kallasvuo would step down effective Sept. 20 and be replaced by Microsoft executive Stephen Elop.