Wireless dialup modem?

Is there such a thing as a dialup modem that sits attached to the phone line, and is connected to via wireless? I had a guy ask me about this because he wants to use his laptop wirelessly, but only has dialup internet. I hadn’t seen this and didn’t find much in a search.

I would assume that because you can attach a modem via serial that it wouldn’t be a big jump to do this.