1. Find "Wi-Fi"
Slide your finger downwards starting from the top of the screen.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-241ee500-ddc5-4a6d-ac5f-5b79579c55fc.png?width=206&height=368)
Press the settings icon.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-dbb7a6d6-840d-4cb3-9460-a04b004072c5.png?width=206&height=368)
Press Connections.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-7aca1091-bb9a-4274-a95b-fd1ae30b5416.png?width=206&height=368)
Press Wi-Fi.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-caaa9eb5-d26f-4649-a138-7227ebfd89da.png?width=206&height=368)
2. Turn automatic use of mobile data on or off
Press ADVANCED.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-460c1991-ba9b-4131-95d7-37fc2f2bcee7.png?width=206&height=368)
Press the indicator next to "Smart network switch" to turn the function on or off.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-0d5bd26a-7048-444d-aec2-80a8342f829f.png?width=206&height=368)
3. Return to the home screen
Press the Home key to return to the home screen.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-081d84b2-18c5-4ff3-ac07-b71d5083f4d4.png?width=206&height=368)