Pairing dualshock 3 to iphone 6

I HAVE A DUALSHOCK 3 controller that i didnt know what to do with it after my ps3 stopped working so i tried to pair it to my iphone 6

first I have change the bluetooth address of it to my iphone 's address then When i go to setting>bluetooth in my iphone it discovers a new device

called "Misc" when i try to pair it, a windows pop up and says enter pin

what is this pin? And can i pair it without needing to jailbreak and break my device's rams

And if its unavailable why?