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Open Whisper Systems has released version 2 of its Signal secure calling app for iPhone. This is an important iteration, as it introduces secure text messaging that’s compatible with the outfit’s TextSecure app for Android — for now, Open Whisper Systems’ secure voice app for Android, RedPhone, remains separate from that, though everything will come together later this year in a Signal app that works across iOS, Android and the desktop. As secure communications operations go, Open Whisper Systems has good credibility, offering end-to-end crypto, auditable open-source code and decent identity verification. The TextSecure protocol has also found its way into WhatsApp, which is why Android-toting users of that Facebook-owned messaging app enjoy extra security these days.