In your threat model take into consideration that there was a "secure phone" sold with an IM app that turned out to be backdoored by the author in cooperation w

In your threat model take into consideration that there was a "secure phone" sold with an IM app that turned out to be backdoored by the author in cooperation with FBI. https://arstechnica.com/tech-policy/2021/06/fbi-sold-phones-to-organized-crime-and-read-27-million-encrypted-messages/ https://arstechnica.com/tech-policy/2021/06/fbi-sold-phones-...