How to configure a Mac for a dialup connection – Leopard and Tiger
In case you visit very rural areas or your beach house where there is no broadband Internet connection, here is how to configure your Mac for a dialup connection:
How To Set Up a Dialup Connection in Mac OS X 10.5 Leopard
How To Set Up a Dialup Connection in Mac OS X 10.3 Panther – 10.4 Tiger
Keep in mind that none of Mac’s current notebooks (the Macbook, Macbook Air, or Macbook Pro) come with a 56K modem. You’ll need to get a USB modem from the Apple Store: