Do you actually read the list of permissions that Android apps are asking for before you install them?
I know most of us treat those permissions like terms and conditions, blindly tapping our way through. But if you actually do, you would be aware of their reach.
Some of your apps can make phone calls
Some can track your location
Some can read your browsing history, contacts, SMS,
Source: How to Manage Android App Permissions to Protect Your Privacy