(a) I moved your thread to the Android Applications subforum since the question isn't device specific.
(b) I played with RedPhone a couple of years back. It requires both parties to have the RedPhone app installed (and validated with their phone number). It works by connecting the call as a VOIP (data) call, and the data transfer is, in fact, encrypted. Since it requires the app to work, it naturally won't work against a landline.
I can't vouch for the security of their product, but it does seem to do what it says.
Is it secure enough? That depends on the sensitivity of your phone calls.
Reason I want this or another call encyption service is because I am trying to become a advocate for the legalization of marijuana here in ohio. Im more interested in changing the phone laws to give more freedom back to people.
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