Iphone 4s Bluetooth greyed out and unavalible

Help.... The Bluetooth on my Iphone 4s stopped working a few days ago.  When reviewing the general settings the Bluetooth (word) is greyed out and reads unavaliable.  If i select the bluetooth option, there is a on off toggle swith, but it is greyed out as well and will not allow me to turn it on.  I have tried turning the Air Plane mode on and off, rebooting, resetting the network and finally a total restore.  Nothing has worked to fix this problem. 

If anyone can shed some light on this, I would greatly appreciate the help.