via BT or USB cable

as the following are true (AFAIK)

1. PC can be connected to the net thru cell phone via BT or USB cable
connection
2. call can be connected to the net thru the PC wi fi card

maybe also this one is true
3. can the cell be connected to the net thru the PC connection via BT or
USB cable?

and if it's true, which is the sw to use?

TIA



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