Nokia's digital maps business Navteq said on Monday it had bought U.S.-based mobile marketing firm Acuity Mobile for an undisclosed amount.

Navteq said in a statement that Acuity Mobile, with 18 employees, would complement its location-based and interactive advertising.

Top cellphone maker Nokia, which bought Navteq last year, has bought more than 10 smaller firms to jump start its internet services business as growth in the cellphones market stalls.

(Reporting by Eva Lamppu)