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Samsung Galaxy J3 (2016)
Android 5.1.1
1 Find "Mobile networks"
Slide your finger downwards starting from the top of the screen.
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Press the settings icon.
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Press Mobile networks.
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2 Turn data roaming on or off
Press the indicator next to "Data roaming" to turn the function on or off.
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3 Return to the home screen
Press the Home key to return to the home screen.
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