hi all it is impossible for me to turn on my wifi after updating my software on my iphone 4s it changed to a gray colour when i updated and i am unable to use the slider to turn it on any one else have this problem???
First thing to try is a reboot of your device. Press and hold the Home and Sleep buttons simultaneously ignoring the red slider until the Apple logo appears. Let go of the buttons and let the devise restart. See if that fixes your problem.