Use “Do Not Disturb” feature of iOS 6
“Do Not Disturb” is one of the latest features of the iPhone. You can at night, or you do not want to be bothered at the time, Switching to this mode.

“Do Not Disturb” option include:
1. Scheduled: Automatically enable the “Do Not Disturb” in your specified time.
2. Allow Calls From: allow everyone, or no one, or some specific people call you.
3. Repeated Calls: If someone calls you twice in three minutes, the call will come in
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