How to make Windows95 autodial from any internet application. Mac Common Questions not covered here. The most obvious cause is that you've neglected to plug your telephone line into your modem. Double check to make sure. A common problem is plugging your telephone line into the wrong jack on your modem.
Many modems have two jacks, one for the telephone line and one for a telephone handset.
Double check to make sure. Double check to make sure that all other devices are on-hook. There may be a problem on your telephone line. The Call Waiting option allows you to be interrupted by an incoming call while you are using the phone line. To temporarily disable Call Waiting for a single out going call, there is often a special code that can be dialed before the phone number.