Hey there,
This is a great question and i would be glad to help answer it. This Gear VR is not compatible with a Samsung S5. It is compatible with the Galaxy Note7,S7, S7edge, Note5,S6edge+,S6, and S6 edge. You can actually use any plug-in headphones with the VR. The headphones should plug in directly to the phone. You can also use Bluetooth headphones to connect to the phone while you use the VR headset. I hope this helps and i hope you have a great day.