RedPhone :: Private Calls content rating is Everyone. This app is listed in Communication category of app store and has been developed by https://www.whispersystems.org. You could visit Open Whisper Systems's website to know more about the company/developer who developed this. RedPhone :: Private Calls can be downloaded and installed on android devices supporting 9 api and above.. Download the app using your favorite browser and click on install to install the app. Please note that we provide original and pure apk file and provide faster download speed than RedPhone :: Private Calls apk mirrors. . You could also download apk of RedPhone :: Private Calls and run it using popular android emulators.