Does what Do Not Disturb already does
Call Bliss gives you two options for handling unwanted calls: Allow or Exclude. Allow requires you go thru your contacts individually to allow their calls to ring thru while all others are denied. Exclude requires you to manually key in excluded numbers which lets all other numbers thru. The problem is Allow blocks ALL texts, including those from your Allowed contacts. Not good if you text a lot. Exclude doesnt have a simple way to add a number to the list like iPhone Block does. My problem was stopping calls from "Unknown". Then it dawned on me to create a contact named "Unknown", leave the contact info blank, and save it as a blocked contact in ios8. Voila.
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Call Bliss - Silence unwanted calls and texts