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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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Related (and possible duplicate): android.stackexchange.com/questions/329/… –  Flow Dec 3 '11 at 13:08
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2 Answers

up vote 2 down vote accepted

RedPhone and TextSecure from WhisperSystems are the best way to achieve encrypted voice and SMS on android.

Those two apps Just Work (tm) and are extremely user friendly.

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Cool, they have released it now :) But now i get a problem when registring with redphone, it says "you must specify your number in international format, eg: +14151231234". But i did. Strange... –  patchie Sep 17 '12 at 7:52
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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.

Whats currently possible on Android is good described by the guardian project in this blog post. BTW: The Guardian Project is good resource when it comes to to privacy and security on Android.

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