iPhone 4S IOs 6.1.3 broke wifi and bluetooth
I am just heading of to the O2 shop with wife's phone.
Symptoms. wifi on-off is greyed out.
Bluetooth spinner of doom permanently.
Reset from settings > doesn't work.
Restore >likewise
Restore to Factory > doesn't work
Hard reset doesn't work
My iPhone 4 sits happily on 6.0 with no problems. I am not going anywhere near the upgrade that iTunes keeps nagging me about.
iPhone 4, iOS 6