OPPO A16s

Find "Carrier"

Slide two fingers downwards starting from the top of the screen.

Find "Carrier"

Press the settings icon.

Find "Carrier"

Press SIM card & mobile data.

Find "Carrier"

Press the required SIM.

Find "Carrier"

Press Carrier.

Select network manually

Press the indicator next to "Auto-select".

Select network manually

Press Off.

Select network manually

Press Off to turn off the function and wait while your phone searches for networks.

Select network manually

Press the required network.

Select network automatically

Press the indicator next to "Auto-select" to turn on the function.

Return to the home screen

Press the Home key to return to the home screen.