Settings is the best and free (ad-supported) app for quick system settings configuration. It has switches for a lot of system settings and a sidebar that is accessible from any app. Settings is optimized for performance and one-hand use. It has beautiful pixel-perfect icons for high definition displays. Download it for free!

PERMISSIONS

Internet Access:
Needed for downloading ads and for completely anonymous usage statistics. Usage statistics can be disabled.

GPS and network location:
Needed to check if GPS is enabled.

Other permissions:
Needed for the various system settings switches.