As the Your Smartphone is Spying on You infographic states, the prevalence of smartphones has made "privacy a thing of the past."
This is mostly due to the location-based apps that are used on a day-to-day basis. These apps are used often because they are extremely convenient for things such as finding the closest businesses, using app-based promotions that rely on check-ins and just for looking up your location on a map. By using these apps, you are allowing companies to track where you go and sell that information to marketers, and if that wasn't enough, some apps can actually tap into your phone's microphone.
Your Smartphone is Spying on You infographic points out how phones let others watch you.