September 06, 2012, 5:36 PM — Here's how you can change Do Not Disturb to allow calls from selected callers on your iPhone 5, in iOS 6.
1. Open the Settings app.
2. Tap on Notifications.
3. Tap on Do Not Disturb.
4. Tap on Allow Calls From.
5. You can choose from these options:
6. You can also choose from the Groups options below the other choices.