HELSINKI, Feb 24 (Reuters) - Nokia (NOK1V.HE) has decided to cut some 90-100 jobs, roughly half the staff, of its mobile advertising business as the economic downturn dampens demand, the world's top cellphone maker said on Tuesday.

The global economy is making advertisers suffer, a Nokia spokesman said.

Nokia entered the mobile advertising market through its 2007 acquisition of U.S. firm Enpocket. (Reporting by Tarmo Virki; Editing by David Cowell)

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