If you're ever going to call Scarlett Johansson, make sure you've first recycled your phone. The actress is starring in an ad that encourages people to recycle their old cell phones. The ads are a play on Scarlett's new movie The Spirit's poster and features one of the film's taglines, "Answer the call!" The Environmental Media Association and Lionsgate created the ads, which also feature Scarlett's co-star Eva Mendes. The goal is to reduce carbon dioxide emissions from the production of new phones. Scarlett's on a do-gooding roll. She just spent four days in Rwanda, visiting AIDS clinics with RED, a project started by Bono and Bobby Shriver to raise money for women and children who are affected by AIDS in Africa.