Mac OS: Modem Unexpectedly Dials

The modem may unexpectedly dial out, automatically attempting to connect to the Internet. Several things may cause this behavior.
Symptom

The modem unexpectedly dials out. This may occur at startup, after disconnecting from an Internet service provider, or at other unexpected times.

Solution

An application or control panel setting can trigger an automatic connection to the Internet.

To prevent unexpected behavior, check the following items to be sure they are set up as you desire. Any of these items could cause automatic connection to the Internet:
Published Date: Feb 20, 2012