Rabbit Hole Of "Secure" Phones

This article from Recode by Kara Swisher called "Former Trump economic adviser Gary Cohn’s next move: investing in a phone secure enough for the president: In a Recode Decode interview, he explains why he’s working to launch a new secure mobile phone aimed at government and corporate customers" got me wondering where the state of the possible was right now on secure phones.

I am pretty much following the recommendations for how to bring a phone to DEF CON -- like this one.  I use to bring a burner phone, but I've found it less and less practical for me.  DEF CON is in theory about as hostile of a Cyber environment as you can summit yourself, but getting targeted by a dedicated adversary is probably worse.

Some links I looked into:

• Who is Hector Hoyos via Tech Crunch
• Hovos Integrity main site
• Hovos Integrity phone site
• Green Hills Integrity Real Time OS (RTOS)
• Green Hills Integrity 179 safety-critical RTOS
• SecureOS
• Samsung's Business Security pages
• A list of "secure phones" (not sure how accurate this is but it seems detailed)
• Blackberry's offerings on secure phones
• Ano-phone
• Cipher phone