How to disconnect my broken iPhone from Bluetooth?

How to disconnect my broken iPhone from Bluetooth? - 1

Added (1). My iphones screen is coming off and i can't use it at all. Is there anyway to disconnect without using my phone?

Put the phone in draw, wait for the battery to die, problem solved.

And no, if the screen is dead, and the power button doesn't work, there's nothing you can do with the phone, until it gets fixed. So if you want to use the Bluetooth device/headset, you will to do so out of range of the "broken" phone or wait for the battery to die in the phone.

Just turn off your phone.