Motricity closed on its $135 million acquisition of InfoSpace’s mobile business unit on Friday.

The deal, which was announced earlier this fall, was made after privately held Motricity raised $185 million in new funding. Billionaire Carl Icahn was among the investors along with Advanced Equities and New Enterprise Associates.

The combined company now counts 11 of the top 13 wireless carriers in North America, including AT&T, Sprint, Alltel and Verizon Wireless. Motricity also added several offices as part of the deal, including operations in the United Kingdom, France and the Netherlands.

“Two of the best companies in the industry are now being integrated to create the premier provider of mobile platform infrastructure,” said Ryan Wuerch, chairman and chief executive officer of Motricity. “We have unparalleled experience in mobile platform development, systems integration, innovation and building world class technology with a proven ability to scale – powering the mobile marketplace including the largest operators and media companies in North America and Europe.”

Steve Elfman, who led the InfoSpace mobile business unit, is president and chief operating officer of Motricity.