HELSINKI -- Nokia will lay off 8% -- some 4,000 employees -- of its workforce in Finland, Hungary and Mexico as part of its now year-long cost-cutting measures.

Nokia had already laid off more than 22,000 workers over the past five quarters, and shut down factories in Romania.

The struggling cellphone maker is still the world's largest with a 26% global share according to IDC. However, smartphone sales fell 31% year-over-year in the fourth quarter, prompting the decision to move that assembly work to Asia.

Among the planned cuts will be 2,300 jobs in Hungary, 700 in Mexico, and 1,000 in Finland, where its Salo plant is Western Europe's only volume cellphone manufacturing factory.