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Modem sound is ONLY played when your mobile is starting connection to mobile network - not when you are already connected and start the app.
1. Start modem sound
2. Connect to mobile network
3. Modem sound is played
1. Connect to mobile network
2. Start modem sound
!!! 3. No sound is played ...
With the listener started, you will find yourself back in 198x when connecting your device to the mobile network.
With listener stopped, there will be no action.
If there will no sound appear after starting app and connecting to mobile network, please check your MediaPlayer volume is not muted!