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.
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Settings: Do Not Disturb
When the new Do Not Disturb feature is enabled, and an incoming caller is not on the Allow Calls From list, or an active white/black list, you aren't even notified of the call. However, you do have the option of allowing repeated calls to ring the phone. This is especially handy in the case of an emergency; if a caller calls more than once, he'll get through.
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