![Apple iPhone 12 Pro Max](http://wmstatic.global.ssl.fastly.net/ml/7121023-f-e2636152-690b-437a-b70b-e0a006490c17.png?width=150&height=320)
Apple iPhone 12 Pro Max
iOS 17
Turn Wi-Fi Assist on or off
You can set your phone to use mobile data automatically when the connection to the Wi-Fi network is weak. To turn Wi-Fi Assist on or off, you need to turn on mobile data.
1. 1. Find "Mobile Service"
Press Settings.
![](http://wmstatic.global.ssl.fastly.net/ml/7121023-f-911dd421-ecd3-45da-8e75-21031e9b5c90.png?width=210&height=456)
Press Mobile Service.
![](http://wmstatic.global.ssl.fastly.net/ml/7121023-f-22319836-64f3-4af9-9862-703150399a4b.png?width=210&height=456)
2. 2. Turn Wi-Fi Assist on or off
Press the indicator next to "Wi-Fi Assist" to turn the function on or off.
![](http://wmstatic.global.ssl.fastly.net/ml/7121023-f-60add21c-4b60-4709-ad45-be89ea24d232.png?width=210&height=456)
3. 3. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.
![](http://wmstatic.global.ssl.fastly.net/ml/7121023-f-60add21c-4b60-4709-ad45-be89ea24d232.png?width=210&height=456)