nVariance, LLC. has Call Bliss (iTunes Link) for the iPhone in the iTunes App Store for FREE (regularly $4.99) for a limited time.

Call Bliss makes using Do Not Disturb on your iPhone easier and more powerful. As Do Not Disturb silences unwanted callers, Call Bliss ensures important callers can still ring your phone, and automatically manages allowed callers based on your location, whether at home, work, or anywhere else!

Call Bliss makes it easy to create groups of callers such as Friends, Family, Co-Workers, etc, to activate with a tap. Save Places to have Call Bliss automatically allow callers whenever you are there, without having to lift a finger.

Blacklist mode makes Do Not Disturb suppress only callers you specify, while ensuring all of your other contacts can still reach you. When you need to focus, tap “Suppress All Callers” to send all callers to voicemail until your project is done.

Call Bliss’ automatic features enable you to keep Do Not Disturb on full time to virtually eliminate unwanted calls, making your days more enjoyable and productive than ever.

Call Bliss requires an iPhone with iOS 6. Do Not Disturb SILENCES unwanted calls, it does NOT BLOCK them, and works only while your iPhone’s screen is locked. Silenced callers can still leave voicemails.