Is it possible to encrypt calls and SMS messages between two Android phones (or even from android to iPhone)?
This firm delivered a beta on Android Market before: http://www.whispersys.com/
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What you want is Zfone on Android. It is currently not native available, but there is a bug report on the offical Android tracker asking for it. Star it, but don't leave a comment without content. This is the best chance to raise Googles attentions on this.