According to a report from Advertising Age, a Federal Trade Commission representative warned mobile content providers that they need to be clearer about the cost of downloading mobile applications. Jonathan Leibowitz, a commissioner with the FTC speaking at a forum on mobile devices earlier this week, reportedly said the commission plans to take action against deceptive mobile content sites.

Leibowitz reportedly said that the FTC is particularly concerned with messaging, games and video services marketed to young people, saying that because kids are quicker to adopt new technologies, they are easy prey for aggressive marketers.

Other concerns raised at the forum include privacy issues around mobile phones, especially around the ability to track customers’ whereabouts.

While consumer groups petitioned the FTC to create limits around acceptable marketing and privacy practices for mobile phones, marketers and mobile media companies urged the commission to not to regulate the still developing market.