Does anyone know what the half-moon symbol is please next to the clock display on the iphone 4S? There is nothing on the apple website about this.
The half moon symbol shows when the "Do not disturb" function is on.
This iOS 6 function turns off all sounds/vibrations (and I think it prevents the software from automatically activating the screen) in a pre-set time period so as to not disturb you.
The toggle is under "settings", just above "Notifications". To set the times, go into "Settings" ---> "Notifications", where it is the first menu item in the list.