Apple MA034Z/A External V.2 USB Modem
The Apple USB Modem is a simple, one-piece external USB modem that's perfect for people who use a dial-up connection to access the Internet and do email. It's small, light, easy to install and even easier to use.  Just plug it into the USB port on your Mac, then connect your phone line to the other end. Open the networking preference panel in Mac OS X, enter your connection information, and click connect. Now you're ready to start surfing, emailing, instant messaging and more.