Note that in iOS 11 doing this through the Control Center it will say “Not Connected” which is exactly what it means - the WiFi hardware is still switched on, i

Note that in iOS 11 doing this through the Control Center it will say “Not Connected” which is exactly what it means - the WiFi hardware is still switched on, it just discconnects: https://support.apple.com/en-gb/HT208086 https://support.apple.com/en-gb/HT208086