Microsoft Lumia 640 XL
Read help info
You can use Wi-Fi as an alternative to the mobile network when establishing an internet connection. This way your phone doesn't use mobile data.
1. Find "WiFi"
Slide your finger down the display starting from the top edge of your phone.
Press ALL SETTINGS.
Press ALL SETTINGS.
Press WiFi.
2. Turn Wi-Fi on or off
Press the indicator next to "WiFi networking" to turn the function on or off.
3. Return to the home screen
Press the home icon to return to the home screen.
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