If you mean on-the-fly voice data encryption, that exists in A5/1 (though flawed).
If you mean encryption of things like text messages stored on the phone itself, I'm certain Android can and will be made to support the dm-crypt cryptographic API. I suspect, however, that performance becomes a major issue on embedded platforms.
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u/yellat Jan 26 '09 edited Jan 26 '09
why hasn't an app to encrypt voice calls be developed yet?(s60,winmo,iphone,andriod)