The first circuit is the one to use. If you get no signal all then you need more volume from the audio output.
1. There is "noise" even when no input and nothing is connected.
2. The phone's output is already at the maximum volume. And when completed I will use it with line level RCA output, so I can't really make it higher.
So you haven't got that circuit correct, because you should not get noise.
The noise is there even when this circuit is not connected