Some Dell Vostro models have physical wifi button on the left along side the USB ports and some have function button to toggle wifi.
Mine is Dell Vostro 14 – 3446
- Look for physical button on the left side to turn on WiFi
- Press and hold down the ‘Fn’ and press the ‘F2’ to turn on WiFi
- Press and hold down the ‘Fn’ and press the ‘PtrScr’ to turn on WiFi