If we talk about a simple phone just an old Nokia 3310 would do it. In terms of smartphones the Blackberry KEYone claims to be the most secure Android Smartpho

If we talk about a simple phone just an old Nokia 3310 would do it. In terms of smartphones the Blackberry KEYone claims to be the most secure Android Smartphone. (disclaimer: I have not used this smartphone and I am not a security specialist.)