No mobile data required, only use a WiFi router and PC as trinsmitter. iPhone or Android as receiver. Please understand that I cannot do this experiment in English at this moment. You can try to follow it through the screen. It's very easy. 00:00 introduction 01:31 Equipment required 02:49 Interpreter Equipment Required 05:11 Listener Equipment Required 07:06 VLC Media Player Transmitter Setting (Mac) 10:50 VLC Media Player Receiver Setting (iPhone) 13:37 VLC Media Player Transmitter Setting (Windows) 16:56 VLC Media Player Receiver Setting (Android) https://www.videolan.org/ My Portable Trival Router: GL.iNet GL-MT1300