http://news.thomasnet.com/fullstory/804953They can buy a usb phone line modem for the computer and it would plug into a URB port on their computer.
The price of modern computers..since most people use cable or DSL they aren't including telephone modems.
Or they can buy a telephone modem card and insert it into the computer, but that requires opening up the side of the computer.
Best bet is to go to the store where they got the computer and buy a usb telephone line modem.