When i switch on wifi, the button becomes green but the wifi mark doesnt appear on the top of the screen and wifi doesn't work.
I tried restoring the network settings, restoring the network settings after switching on airplane mode, rebooting the phone, restoring the phone from a back up, restoring the phone as new but still it doesnt work!
Read more: Wifi doesn't work in iphone 4S iOs 7.1.2?