Help and Support for
Samsung Galaxy A5 (2017)
Android 6.0
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My Samsung Galaxy A5 (2017) Android 6.0 uses a large amount of mobile data
Cause 1 of 3: Automatic use of mobile data 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.