Have not tried it myself yet, as I currently have access to broadband but thought I would share with DU members who rely on dial up and are always looking for better deals. I don't know how good they are, though.
"NO Dialer Applications needed!
Windows, Macintosh, and Linux supported!
Service Available Nationwide!
Connect via Bluetooth or USB using your Cellphone!
Local dial-up numbers for Southern California
You can use your home phone to connect as well!"