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Open Whisper Systems is both a large community of volunteer Open Source contributors, as well as a small team of dedicated grant-funded developers. Together, we're working to advance the state of the art for secure communication, while simultaneously making it easy for everyone to use. Private messagingFor iPhone and Android Say Anything - Send high-quality group, text, picture, and video messages, all without SMS and MMS fees. Be Yourself - Use your existing phone number and address book. There are no separate logins, usernames, passwords, or PINs to manage or lose. Stay Private - We cannot read your messages, and no one else can either. Everything is always end-to-end encrypted and painstakingly engineered in order to keep your communication safe. Get Organized - Archive functionality makes it easy to keep track of the conversations that matter to you right now. Pay Nothing - The development team is supported by community donations and grants. There are no advertisements, and it doesn't cost anything to use.Private callingFor iPhone and Android Speak Freely - Make crystal-clear phone calls to people who live across town, or across the ocean, with no long-distance charges. Stay Private - We cannot hear your conversations, and no one else can either. No exceptions. Pay Nothing - The development team is supported by community donations and grants. There are no advertisements, and it doesn't cost anything to use.Details for Apple Compatibility: Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.Details for 'Droid Compatibility: Requires Android 2.3 and upPrivacy is possible, Signal makes it easy.Using Signal, you can communicate instantly while avoiding SMS fees, create groups so that you can chat in real time with all your friends at once, and share media or attachments all with complete privacy. The server never has access to any of your communication and never stores any of your data.★ Say Anything. Signal uses an advanced end to end encryption protocol that provides privacy for every message every time.★ Open Source. Signal is Free and Open Source, enabling anyone to verify its security by auditing the code. Signal is the only private messenger that uses open source peer-reviewed cryptographic protocols to keep your messages safe.★ Be Yourself - Signal uses your existing phone number and address book. There are no separate logins, usernames, passwords, or PINs to manage or lose.★ Group Chat. Signal allows you to create encrypted groups so you can have private conversations with all your friends at once. Not only are the messages encrypted, but the Signal server never has access to any group metadata such as the membership list, group title, or group icon.★ Fast. The Signal protocol is designed to operate in the most constrained environment possible. Using Signal, messages are instantly delivered to friends.★ Speak Freely - Make crystal-clear phone calls to people who live across town, or across the ocean, with no long-distance charges.