Chosen Solution
I switch-on the bluetooth device under general settings and the problem still the same. buetooth not working.
More than likely you have a hardware issue. I suggest restoring your iPhone using iTunes to eliminate any possible software problems.
I want to sync my iPhone to my beats wireless, but when I turn on my BT, it just stay loading… What I need to do to my BT come back been how it was?
Bluetooth in new version