Microsoft Lumia 950

Find "SIM settings"

Slide your finger downwards starting from the top of the screen.

Find "SIM settings"

Press All settings.

Find "SIM settings"

Press Network & wireless.

Find "SIM settings"

Press Mobile & SIM.

Find "SIM settings"

Press SIM settings.

Select network

Press Search for networks.

Select network

Press the drop down list below "Select a network".

Select network

If you want to select a network automatically, press automatic.

Select network

If you want to select a network manually, press the required network.

Select network

Press OK.

Return to the home screen

Press the Home key to return to the home screen.