Put your device to test mode and then again change it to normal mode using Nokia care suite That is the final solution for this other than flashing your entire rom

Put your device to test mode and then again change it to normal mode using Nokia care suite This trick has been said working for some of my friends and me too!

Most simple trick First do the thing Digital plumbing said above And then press and hold vol down and power button both at the same time for a FEW SECONDS The Phone restarts and problem gone Tried it with my lumia and it worked