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With dialup, you cant share it, it only allows one connection at a time, trust me I tried when I had dialup. Until you can upgrade to something a little more faster, youre stuck with one computer connected at a time. If you can get DSL, get it, because it will be a little faster, and will allow more then one computer on at a time.
When I had dial-up I was able to share it with my two computer at the same time. As for the OP just use wifi or buy a data plan.
 
Dialup via network modems used to be the way it was done

As a few experienced guys here have pointed out, yes we used to do exactly this with smartphones around the turn of the century. (Boy that sounds old, eh?)

And no, it was not over analog, as someone guessed. It was all digital from the phone to the network. The way it worked was this:

You dialed your carrier via a special star (e.g.: *11) number. At that point, you were digitally connected to a modem on a carrier's server. Your handheld sent AT modem commands and data, and the carrier's modem connected over regular lines to your ISP.

Of course, you had to sign up and pay for this service, because it cost to keep racks of modems (and/or virtual software modems) around to support this. Also, you never got any higher transfer speed than what a modem could support (e.g. 56Kbps).

It's possible that ATT even still has such a service available, but it'd no doubt be cheaper and quicker to use 3G.
 
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