Strange cords found behind radio

I was trying to install a remote car starter, and I took out the stock head unit to get back to where the starter is. After taking it out I found 3 cords not connected to anything in there. 2 of them look just like headphone type cords, the 1/4 size ones. The 3rd is just like an ethernet cable. I just bought the car a couple months ago so I don't know what all the stuff was that used to be on it but obviously someone added something, and there are 2 antennas in the back of the car that I don't know what they go to. One is probably onstar, the othe I have no idea. Anyone know?

Mystery solved! I was able to track the wires to an audiovox box. I looked up the number and it's a cell phone accessory. It's like an older bluetooth feature where you can have hands free and all