# Free, Worldwide, Encrypted Phone Calls for iPhone

DevFeed: [Free, Worldwide, Encrypted Phone Calls for iPhone](<https://devfeed.tech/articles/free-worldwide-encrypted-phone-calls-for-iphone-1842.md>)

Original publisher: [Read original article](<https://signal.org/blog/signal/>)

Published: 2014-07-29T00:00:00Z

Content type: article

Language: en

Sources: [Signal Blog](<https://devfeed.tech/sources/signal-blog.md>)

Topics: [iphone](<https://devfeed.tech/topics/iphone.md>), [Mobile](<https://devfeed.tech/topics/mobile.md>), [Android](<https://devfeed.tech/topics/android.md>), [App](<https://devfeed.tech/topics/app.md>), [Protocol (disambiguation)](<https://devfeed.tech/topics/protocol.md>), [Open Source](<https://devfeed.tech/topics/open-source.md>), [Browser Extension](<https://devfeed.tech/topics/browser-extension.md>), [browser](<https://devfeed.tech/topics/browser.md>)

Tags: [android](<https://devfeed.tech/tags/android.md>), [browser](<https://devfeed.tech/tags/browser.md>), [communication](<https://devfeed.tech/tags/communication.md>), [iphone](<https://devfeed.tech/tags/iphone.md>), [mobile](<https://devfeed.tech/tags/mobile.md>), [open-source](<https://devfeed.tech/tags/open-source.md>), [privacy](<https://devfeed.tech/tags/privacy.md>), [protocol](<https://devfeed.tech/tags/protocol.md>), [signal](<https://devfeed.tech/tags/signal.md>)

## AI overview

Signal is a free, worldwide encrypted voice-calling app for iPhone that is compatible with RedPhone for Android. It uses existing phone numbers, privacy-preserving contact discovery, ZRTP, mobile-network optimizations, and push notifications. The article also describes plans to unify private voice and text communication across iPhone, Android, and the browser.

## Source excerpt

At Open Whisper Systems, we want everyone to have access to advanced secure communication tools that are as easy and reliable to use as making a normal phone call or sending a normal text message. Over the past year, we've been working to bring the privacy software we've developed for Android to the iPhone, and today we're releasing Signal - free, worldwide, encrypted voice calls for iPhone, and fully compatible with RedPhone for Android. Read more...