Blackphone 2 can encrypt everything from your selfies to voice calls - and is impossible to track

http://www.dailymail.co.uk/sciencetech/article-3248377/The-secure-phone-world-799-Blackphone-2-encrypt-selfies-voice-calls-impossible-track.html
At a certain point, any signal or data-stream can be intercepted. However, its still a pretty good secure phone.

Of course, the big brand names keep putting out highly desirable tech.
http://www.dailymail.co.uk/sciencetech/article-2758384/Simply-best-smartphones-MailOnlines-verdict-Apples-iPhone-6-6-plus.html
That's the BIG & small of it all.
http://www.dailymail.co.uk/sciencetech/article-3261150/Call-megatablet-Samsung-s-giant-18-5inch-Galaxy-View-leaks-dwarfing-Apple-s-iPad-Pro-12-9inch-screen.html

https://en.wikipedia.org/wiki/FBI-Apple_encryption_dispute#Background

https://en.wikipedia.org/wiki/Steve_Jobs_(film) , 

https://en.wikipedia.org/wiki/Steve_Jobs_(film)#Reception

https://en.wikipedia.org/wiki/List_of_artistic_depictions_of_Steve_Jobs