MWW has been brought in following a non-competitive pitch as Opera Mediaworks aims to firm up its position as a leader in the industry.
Previously known as 4th Screen Advertising, the Silicon Valley-based mobile advertising platform has offices across the world and works with 18 of the top 25 media companies worldwide.
The decision to bring in an agency follows a succession of acquisitions including Apprupt, a mobile advertising company in Germany with a reach 22 million mobile users.
Mark Slade, MD, EMEA, Opera Mediaworks, said: "We wanted to go beyond the normal, everyday trade PR to create something new and innovative that marks us out as genuine thought leaders in our space."
Paddy Herridge, UK MD of MWW, said Opera Mediaworks had "a great reputation for cutting-edge technology, data insight and customer service that’s unmatched in the industry". He added: "Our job is to reinforce that positioning as the company consolidates its brand following recent acquisitions."