Can I play audio from my iPhone on my Mac?
Simple, and simply surprising:

First, check that you have enabled the iPhone/iPad as an audio input device in Audio Midi Setup.app:



Plug in your iPhone to your Mac using your Lightning Cable (doesn't work with 30 pin iPhones, sorry. [Yes I know you said 3GS])

Launch QuickTime Player

Choose File&gt; New Audio Recording

Click the hard-to-see down arrow next to the Record 'button', choose iPhone under 'Microphone'

Play your music, game whatever on your iPhone, sound will come thru your Mac.


No need to hit record, the sound will play even if you don't record. Just turn up the volume.

Note: for those who want a louder volume, go to the system preferences on your Mac. Then go to the sound settings and you can increase the output volume so it is louder.