![OPPO A57 4G](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-ccc1f389-7e5c-4ef2-86b2-dac3129e8544.png?width=150&height=320)
OPPO A57 4G
Android 12.0
1 Find "Mobile network"
Slide two fingers downwards starting from the top of the screen.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-9a7d7d49-1709-4d0b-a490-fcda21ff950e.png?width=200&height=446)
Press the settings icon.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-9b5b36bf-abf1-4288-9ddc-88a494d4fae2.png?width=200&height=446)
Press Mobile network.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-9f6e3bbb-0894-4769-ae20-8552eedda8c0.png?width=200&height=446)
2 Turn data roaming on or off
Press the required SIM.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-eb9cf590-206a-48c5-a938-ad0f02190b4b.png?width=200&height=446)
Press the indicator next to "Data roaming" to turn the function on or off.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-7b35e380-f160-4716-96d6-aa91bcf8986a.png?width=200&height=446)
If you turn on the function, press Turn On.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-fb3c8393-f226-415c-bb03-e4e494b647e6.png?width=200&height=446)
3 Return to the home screen
Press the Home key to return to the home screen.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-7b35e380-f160-4716-96d6-aa91bcf8986a.png?width=200&height=446)