![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 use of SIM 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 "Enable" to turn use of the SIM on or off.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-056e63c8-2bc0-4c70-9a2e-68528b8761eb.png?width=200&height=446)
Press the Return key.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-056e63c8-2bc0-4c70-9a2e-68528b8761eb.png?width=200&height=446)
3. Select default SIM for voice calls
Press Calling.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-eb9cf590-206a-48c5-a938-ad0f02190b4b.png?width=200&height=446)
Press the required setting.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-adaaf5d0-c71c-415a-9a4c-1aaab2aab847.png?width=200&height=446)
4. Select default SIM for mobile data
Press Internet.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-eb9cf590-206a-48c5-a938-ad0f02190b4b.png?width=200&height=446)
Press the required SIM.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-b3e18fa9-db00-4de0-b8b0-a72aa2e54516.png?width=200&height=446)
5. Return to the home screen
Press the Home key to return to the home screen.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-eb9cf590-206a-48c5-a938-ad0f02190b4b.png?width=200&height=446)