iOS 11 is the first iOS version to support WebRTC.
Actually you meant iOS 11 is the first to support webrttc in its browser (safari). You could develop native apps with webrtc in previous versions too.
But I cannot connect with device in external network. I just only connect with same wifi
No, you can connect any internet connected device with any other internet connected device, even if they are on different networks.
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iOS 11 is the first iOS version to support WebRTC.
Actually you meant iOS 11 is the first to support webrttc in its browser (safari). You could develop native apps with webrtc in previous versions too.
But I cannot connect with device in external network. I just only connect with same wifi
No, you can connect any internet connected device with any other internet connected device, even if they are on different networks.