What is a "cellular router" or "3G" device?

What is a "cellular router" or "3G" device?

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A cellular router or 3G device is the same technology that allows you to talk on the cell phone, where your wireless carrier is basically converting your voice into data. What these 3G devices now allow you to do is plug in with a card that has a phone number assigned to it, but the card's only function is to transmit and receive data. It does no talking, it simply sends and receives data through the use of this 3G technology.