UnTraxxas

Maybe try to plug your phone into Line In port (blue color) on your pc and than add it to the output in sound settings in windows.
 

I just tried it with my phone and it worked, after steps below:
Try right clicking on the volume thingy in the bottom right and select recording devices.
Select line in and hit properties.
Switch to tab "listen", and tic the box "Listen to this device"
Hit OK in both windows. You should be able to hear sounds from your phone now.