the Blackberry smart phones are by far the best, when it comes to security. Currently, I have three BBs in my household and thus know all the features these phones boast in areas like encryption, which go far beyond what other phones offer. I can especially recommend the Z10, as it is both durable and fast, but also unbelievably cheap at the time.
well, BBs current primary goal is to offer the, in their eyes, best solutions for big company’s and governments, which is why they also keep a focus on security. Many (actually pretty much all) the security features, included in Silent OS, were in BB 10 a long time ago, except for maybe their encrypted VOIP, but for that, your partner needs a Blackphone or at least the necessary software plus fees, which also seems to run on BB.