Looks more lightweight than the last secure phone design I had. The need for dedicated chips for CPU hardening, baseband firewall, and power isolation made it quite bulky. Looking for a commercial model, I settled on this:<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Nokia_9000_Communicator" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Nokia_9000_Communicator</a><p>Didn&#x27;t build it for obvious reasons. It was the shit back in the day, though, with probably some people willing to buy if they get trusted chips. Not sure enough on return to want to risk it, though.