Google Pixel 4 XL
Android 10.0
1 Find "Advanced"
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press Network & Internet.
Press Mobile network.
Press Advanced.
2 Select network automatically
Press the indicator next to "Automatically select network" to turn on the function.
3 Select network manually
Press the indicator next to "Automatically select network" to turn off the function and wait while your phone searches for networks.
Press the required network.
4 Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.