Samsung Galaxy S21 Ultra 5G

Find "Network operators"

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

Find "Network operators"

Press the settings icon.

Find "Network operators"

Press Connections.

Find "Network operators"

Press Mobile networks.

Find "Network operators"

Press Network operators.

Select network manually

Press the required SIM.

Select network manually

Press the indicator next to "Select automatically" 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 "Select automatically" to turn on the function.

Return to the home screen

Press the Home key to return to the home screen.