This is how your phone/laptop acts when your Wi-Fi is on:
Due to the vulnerability above, a malicious hacker can spoof as one of the “authorized” hotspots on your list, and trick you into connecting to them. They know which hotspots to pretend because of #1 above. After that, they can see all traffic including emails, banking transactions, and other private information. They can also install malware to spy on you through your camera & microphone.
Here are some examples of how to turn the wifi off:
Touch Settings > Wi-Fi > Slide the Wi-Fi button On/Off
Touch Settings > Wi-Fi >Touch the Wi-Fi button On/Off
Install McAfee Safe Wi-Fi through the Play Store. The app automatically turns Wi-Fi on/off when you’re near/far from authorized hotspots.