Signal allows you to make private phone calls ([RedPhone protocol](https://github.com/WhisperSystems/RedPhone/wiki)) and private text messaging ([TextSecure protocol](https://github.com/WhisperSystems/TextSecure/wiki)).
Signal is a messaging app for simple private communication with friends.
[](https://itunes.apple.com/app/id874139669)
## Translation
Help us translate Signal! The translation effort happens on [Transifex](https://www.transifex.com/projects/p/signal-ios/)
## Interoperability
Signal works with [RedPhone](https://github.com/WhisperSystems/Redphone) and [TextSecure](https://github.com/WhisperSystems/TextSecure) on Android.
Help us translate Signal! The translation effort happens on [Transifex](https://www.transifex.com/open-whisper-systems/signal-ios/)
## Contributing Code
Instructions on how to setup your development environment and build Signal-iOS can be found in [BUILDING.md](https://github.com/WhisperSystems/Signal-iOS/blob/master/BUILDING.md).