The Electronic Frontier Foundation has issued a "Mobile User Privacy Bill of Rights".
Here's an excerpt:
Mobile smartphone apps represent a powerful technology that will only become more important in the years to come. But the unique advantages of the smartphone as a platform—a device that's always on and connected, with access to real world information like user location or camera and microphone input—also raise privacy challenges. . . .
Fortunately, frameworks exist for understanding the privacy rights and expectations of the users. The following guide of best practices pulls from documents like EFF's Bill of Privacy Rights for Social Network Users and the recently released White House white paper "Consumer Data Privacy in a Networked World" to set a baseline for what mobile industry players must do to respect user privacy.