Hello community, since I`ve updated from 6.0 to 6.1 I`ve had network connection issues with my iPhone 4S. At least since yesterday the WiFi button in "settings" is greyed out, the bluetooth setting is always searching for connection without enabling bluetooth and - after I updated today to iOS 6.1.1. - WiFi is not longer a tethering-connection option. First I am searching for help at the internet, after I`ve reseted, deleted all settings a.s.o.. I found a lot of google results describing similar problems. One of them you can find here: https://discussions.apple.com/thread/4478539?start=180&tstart=0 For second I call Apple Care. Apple told this seems to be a hardware defect, but they not sure. But unfortunately the warranty time of my iPhone was expired. I don`t think it`s a hardware failure, because 2 other people of my IT company have 100% the same issue since they made also updates with their 4S and 5 iPhones yesterday. If this was really a hardware defect, what I can`t believe, this seems to be caused by updating firmware/iOS. Does somebody has the same problems? Any helpful suggestions? I am not willing to buy an apple care protection plan for solving issues, which are caused by updates. This would be the same like paying for a capital engine failure, after a mechanic forgot a few screws after a car service.