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Safari doesn't support it. But native apps can support it. I believe Chrome for mobile also supports it.

Chrome on iOS does not. Chrome on some Android devices does.

If you use Bowser (https://labs.ericsson.com/apps/bowser) you can use WebRTC on web pages with iOS. Otherwise you can build the WebRTC library with your app and make use of the technology natively (https://code.google.com/p/webrtc/)

you should check out http://github.com/mschmulen/webrtc-demo it has web rtc running on iOS .