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To turn off the WWAN radio:
You can turn off the WWAN radio the same way you turn it on.
If you want to quickly turn off all wireless radio, simply switch on Airplane
mode. You can control the Airplane mode using one of the below methods.
Press Fn+F1.
Select the network icon in the lower right of the taskbar. Then, select
the Airplane mode button.
Setting up a WWAN Connection
Go to Settings Network & Internet Cellular. (For detailed information on
cellular settings in Windows, see Microsoft Support website.)