They can read your contact details, call logs, location, browser history, your personal message, images, videos
they can also access your mic,camera, call conversation & many others, so they can see what you do even if your phone is locked or not!!
Patron+ is protecting you from this kind of application. It will help you to detect dangerous applications permission and also you can stop this kind applications and if you want uninstall application then you can directly uninstall it.
This is a demo version of Patron Mobile Security app, you can purchase the full version after you find it useful.