I recently looked at providers. For wider adoption, it would be good to use a ZRTP service to contact normal phones (PSTN). Silent Circle actually does this:

I recently looked at providers. For wider adoption, it would be good to use a ZRTP service to contact normal phones (PSTN). Silent Circle actually does this: https://silentcircle.com/services https://silentcircle.com/services Unfortunately the monthly cost on top of a normal phone contract it too high for a lot of people (me included). Ideally, it should be as cheap and easy as Skype and then the crowds will follow.