"By acquiring Enpocket, Nokia will accelerate the scaling of its mobile advertising business, leveraging Enpocket's platform, and strong partnerships with advertisers, publishers and operators," the Finnish company said.
No financial details were disclosed, but Nokia said the deal was expected to be ready by the end of 2007.
Last month, Nokia unveiled new Internet services and gadgets to help customers download music and play games on mobile handsets in a strong push to challenge rivals, including Apple's iTunes and iPod. The company also launched its Web services in a new site known as "Ovi" that will include an online music store.
Enpocket, based in Boston, Massachusetts, provides technology and services that allow clients, including MasterCard, PepsiCo Inc. and Vodafone Group PLC, to offer mobile advertising through various formats such as mobile phone text messages and on the Internet.
Nokia, based in Espoo near the Finnish capital, Helsinki, has sales in 130 countries and employs 110,000 people worldwide.
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