Even though it would be better to have a unified app for calls and texts, Open Whisper has not completed that process yet. The company is working on it, though, and has said that RedPhone, TextSecure and Signal will be unified under one platform by the end of the year, hopefully. They will also release desktop applications to complement the suite in the future, which is neat. For now, you’re going to have to use TextSecure for messaging and RedPhone for calls on Android. Edward Snowden didn’t mention TextSecure, but since he is supportive of Open Whisper solutions (who have provided encryption services to WhatsApp, too, although not as comprehensive), it’s safe to assume that he would recommend it. TextSecure is the Signal 2.0 app’s Android version, so it basically offers texting in a safe and encrypted way, using the same protocols as RedPhone. Just as the previous apps, it’s open source and uses your own phone number, so it’s very easy to use. You can download it from the Google Play Store.