Right click-My Computer-Management-Device Management (at this time, there is no mobile phone and network card plugged into USB, so it is not shown here):

Then plug in a mobile phone or USB device.

Click on the port to see the USB port number at this time.

The modem port can be connected to the Internet (this port number needs to be seen in the software used. General port number and modem port number are continuous): How to find out the version of USB interface on the computer?