iOS 6 appears to be a great update, with many new and useful features for iPhones and iPads--but the changes aren't so radical that you'll have to learn the OS all over again. Apple has made important changes to Music, iTunes, Maps, and Siri. It has added Facebook and Twitter integration, and a useful location-based feature called geofencing.
Settings: Do Not Disturb
You can also set DND to answer with predefined actions, such as a text message or by forwarding the call.
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