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WiFi not connecting on Galaxy S4
After upgrading my Samsung Galaxy S4 to 4.4.2 I haven't been able to connect to any WiFi networks. When I pull down the notification bar and tap the WiFi icon to turn the WiFi on it turns a dull green and stays like that for a few seconds, then goes back to being the colour before I tapped it. Other times, it turns the usual green but it doesn't connect to any WiFi networks and says "not in range" to those WiFi networks that I connected to before the update. It shows it scanning but nothing comes up. Another member of my family has the Samsung Galaxy S4 and they haven't updated there phone to 4.4.2 yet and they haven't got this problem.
I have no clue how to sort this out. I've turned my phone off and waited a bit then turned it back on many times, to no avail. Any help would be greatly appreciated.