Apple made this claim of end-to-end voice encryption of FaceTime Audio in a June 16, 2013 press release. Google now makes the same claim about Hangouts. There is skepticism in the hacker community. Any Linux-based OS, such as iOS and Android, can be hacked. Not so with Blackberry OS 10, which was develooed by engineers from QNX, which Blackberry acquired in 2010. Also, Facetime Audio voice quality is dreadful.
You don't see the White House or Angela Merkel using these applications for voice mobile communications. The former uses Blackberry BES and the latter uses Blackberry Secusmart.
I love how people who don't use Apple technology make claims such as "Facetime Audio voice quality is dreadful," when it is the same voice quality used in video made with iPhones, which have been used to make first run commercial movies and television shows, television news work with perfect clarity, enterprise grade tele-conferencing, and training videos. . . as well as thousands of podcasts. Ergo, what you just wrote is just FUD. I use FaceTime regularly and the quality is superb.
Angela Merkel's just discontinued using an iPhone because of the Obama administration's NSA monitoring of carrier traffic and the erroneous claim from Snowden that all Apple iPhones were compromised by the NSA, which has been shown to not be possible, and was actually referring to Android phones, iPhones that had been physically intercepted to install specific hardware/software, and RIMM Blackberry phones that were also intercepted. Merkel's anger at the U.S. resulted in the German government going back to RIMM Blackberries.
Oh, and Kennard, did you bother to read your link about skepticism? You might find it’s not as skeptical as you seem to think. Every poster who brings up a challenge comes across as not knowing what they are talking about and are pretty much summarily shot down by people who do know.
I’m not sure why you think that QNX can’t be hacked.