WASHINGTON (WUSA) -- More and more of us are seeing pop-up ads on our phones and they are invading our privacy.
The ads are able to change the settings on your smartphones, your bookmarks, and even take your contact information, which can be sold to marketers. So, how does it happen?
Mobile security company Lookout says thousands of smartphone apps are powered by rogue advertising networks. So when you download the app, you're getting the advertisements, too.
Unfortunately, you might not know it's happening because these aggressive ads can be hard to spot. Sometimes they're in the form of a text message, an app icon, or some networks place them in users' notification bars or home pages. But it's not a huge problem: only 5 percent of free apps use an aggressive ad network.