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Cause 1 of 3: Automatic mobile data usage is turned on
If automatic mobile data usage is turned on, your phone will use mobile data when the connection to the Wi-Fi network is poor.
Solution: Turn off automatic use of mobile data.
Slide your finger downwards starting from the top of the screen.
Press the settings icon.
Turn on Wi-Fi
Press the indicator to turn on the function.
Turn automatic use of mobile data on or off
Press the menu icon.
Press the indicator next to "Switch to mobile data" to turn the function on or off.
Return to the home screen
Press the Home key to return to the home screen.
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