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Yes. An air card is essentially a modem with a cellular phone built-in.
An external modem is usually more expensive than a card modem, even though the external modem is usually slower. The external modem has the added expense of external casing and additional translation to serial, parallel, SCSI or USB formatting.
image and ans modem card
You can connect an audio card or a modem card to an audio/modem riser (AMR) slot.
If your modem has wireless interface, yes you can.
That would be the network card or modem.
What is the difference between a data card and an usb modem?
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Modem Card
It either can't communicate on line, or you would have to use a NIC (Network Interface Card) to do so.
A network interface card (NIC) would allow that.
MODEM