It seems to work for voice calls. I can't really see any reason to use this over Redphone unless you need interoperability with iPhone users or need calling outside of the countries that Redphone supports. Kryptos drains battery because it needs to keep a network connection open. Redphone doesn't because it uses SMS for signaling. Kryptos is $10/month. Redphone is free. Redphone also wins on transparency. We know very little about the Kryptos protocol or codec (AES, RSA - that's it.) Redphone is open source and uses ZRTP which is an open standard. We know, for instance, exactly how Redphone mitigates man in the middle attacks. Csipsimple is another alternative for free encrypted calls using the ZRTP standard. It inter operates with other ZRTP clients like acrobits on the iPhone and Jitsi on desktop computers. Put that together with a free SIP (e.g. Callcentric) account, and you can have cross platform encrypted phone calls for free instead of paying $10/mo.
Works Works on galaxy note... 10$ monthly subscription monthly though, make sure you use google checkout or paypal, not their own site, my cc 'suddenly' got used by someone else...
Works Great & Extra CASH!! Been using on my Samsung S5 and Note 8 for over 30 days. Great sound and secure. Feels like I am a secret agent, knowing my privacy is secure... Worked everywhere I've tried it. Home wifi, work wifi, Caribou Coffee and across both my cellular carriers (Verizon & AT&T). Signed up for their GOLD level and happy to be aboard.
Update Font size for input Font size to input data is ridiculously small for a 5.1 in android screen.
Trying to fill the gap from whispersystems sellout. $10. A month? No way. How about $10.00 app?
Good app This app works well most of the time but not always. For $10 a month I would expect it to be flawless. I am now using "voip one click" for free encrypted calls and encrypted chat, works well and I have had no problems with it.
TextSecure makes privacy simple. Send text, photos, and group messages for free!