When activated, a crescent moon appears in the notification bar up the top of the screen, indicating that it is activated. This mode silences all sounds and notifications, and prevents the screen from illuminating.
However since the turn of the year, many users have reported (myself included) that this feature doesn't work properly when you have it set to a schedule. Either it doesn't activate at the right time, or is doesn't come out of DND mode, meaning that until you manually turn it off, your device will remain silenced. As you can imagine, this is really annoying for some people who will have missed phone calls or messages because they didn't know their phone wasn't ringing.
Apple have acknowledged the problem, but instead of sending out a fix they've suggested to just use the mode manually until after January 7, where the problem is expected to resolve itself.
SymptomsAfter January 1st, 2013, Do Not Disturb mode stays on past its scheduled end time.
Apple has had problems in the past with New Year's bug's where alarm clocks set in the new year wouldn't sound off causing people to be late for work, miss flights etc. The company also promised at the time the problem would "resolve itself" by the first Monday of the year.ResolutionDo Not Disturb scheduling feature will resume normal functionality after January 7, 2013. Before this date, you should manually turn the Do Not Disturb feature on or off.
To turn off the scheduling feature, tap Settings > Notifications > Do Not Disturb and switch Scheduled to Off.
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