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OPPO A57s
Android 12.0
1 Find "Mobile network"
Slide two fingers downwards starting from the top of the screen.
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Press the settings icon.
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Press Mobile network.
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2 Turn data roaming on or off
Press the required SIM.
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Press the indicator next to "Data roaming" to turn the function on or off.
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If you turn on the function, press Turn On.
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3 Return to the home screen
Press the Home key to return to the home screen.
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