I updated my 16GB iPhone 4S to iOS 6.1.3 last week.
Everything was working fine, though I did notice a significant drop in battery life. (My Mophie battery case usually had no problem saving me in the afternoon if I used more navigation or internet radio than usual. Now I've been needing that 2nd charge almost daily)
Today when I got into my car, it would not connect to the bluetooth stereo. I checked Settings>Bluetooth and saw the rolling circle. Closed all apps, restarted phone, no change, bluetooth still "thinking"... A hard reset also had no effect.
I checked Settings>WiFi, it was turned off and grayed out, will not allow me to turn wifi on.
When I got home I found numerous threads online describing this issue, seeming to vindicate my fear that it WAS the iOS update.
I did immediately find Apple's ts1559 support document.
-Of course I'm not in Airplane Mode (Is it turned on?)
-Of course I tried restarting my device
-Yes, I have the most current vresion of the OS.
-Settings>General>Reset>Reset Network Settings did nothing.
-Backed up and restored the device... Absolutely no change.
I have NEVER jailbroken the device, only ever dropped it once (months ago) and have no water damage
How can this many people correlate the problem to iOS 6.1.3 and have the company claim the device is out of warranty? If Apple won't stand behind their hardware any longer than 12 months, I can see why people do wreckless things like jailbreaking.
ALSO- Why does Apple make it impossible to downgrade? I can understand preventing someone from downgrading to an archaic iOS, but going back one step to iOS 6.1.2 would help troubleshoot!
I have an appointment for the "Geniuses" at Apple to take a look at it tomorrow morning, we'll see what they say. I hope they've had enough people with the exact same issue by now that they give me some respect despite being 2 months past my warranty.