You can tell a client's network is not strong enough to connect smoothly because their video feed is very blurry and/or choppy. It can look like you’re staring at a picture that is made up of too few pieces. You’ll often notice that the client's audio is very jittery, or goes silent despite knowing that your customer is speaking.
To switch off WiFi on an iPhone, ask your customer to tap their Home button, then swipe up from the bottom of the screen to access the network icon.
To switch Wifi off on an Android device, your customer can swipe down from the top of their screen. Go to network icon and tap on it to turn it off or on.
Related article: Connectivity issues.