This phone Settings app provides easy access for your android device settings. First two categories provide common system settings like volume control or manage and screencast and most used settings like Bluetooth and flight mode shortcut and many others like power usage. Second category call setting provides you ussd code or mmi code for setting as ussd code dialer through which you can use it as call waiting enabler , Firmware version check etc. Ussd code may not work in some mobile phone as i