Hello, I have built some WebRTC Applications before, which did not even worked on Iphone 5s (IOS 11.x.x), and as I am aware FB Messenger uses React Native which also has webrtc implementation there, so it won't work on older phones as well as i think, but as i tested Messenger even worked on Iphone 4s and i bet it would work on iphone 4 as well. how do they achieve this? whats the technology they are using?
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