Gnupg-users Digest, Vol 184, Issue 22

[Allen M. Juinio]

> Date: Wed, 30 Jan 2019 20:44:07 +0100
> From: Stefan Claas <sac at 300baud.de>
> To: Peter Lebbing <peter at digitalbrains.com>
> Cc: gnupg-users at gnupg.org
> Subject: Re: [OT] Where can I find some papers to read on mail (and
>    envelope) security?
> Message-ID: <20190130204407.4c195dc7 at 300baud.de>
> Content-Type: text/plain; charset=US-ASCII
> 
> [SNIP]
> 
> On the other side i wish PGPfone would have been further developed.
> I found it, way back then, pretty cool and super easy to use, compared
> to PGP or GnuPG.
> 
> Regards
> Stefan

Have you tried using Signal from Open Whisper Systems?  They have both an Android and Apple version. 
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