The fact it is developed in Europe and based on Android gives some hope.
It also uses all the "right" key exchange and encryption mechanisms.
The demand will certainly jump. And that most likely means the price will drop.
And eventually some of those features will leak into mainstream Android ROMs.
Since the German version runs on plain vanilla Galaxy S III, there is some reason for optimism...
I think it's just about time to ban the S III in the US for violating some Apple patent...
As a side note: the whole end-to-end encrypted communication system (if needed) would need to be developed from scratch.
Not only to make sure there are no obvious backdoors planted by the NSA, but mostly to avoid snafus like this http://arstechnica.com/security/2014...rypted-drafts/
That's the nice thing about VoIP, in that it's easy to encrypt. SIP supports a variety of methods, so you can choose the best one. Also, AES is an open design (it came about in a competition and which anyone can examine).