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Though everything is set up correctly, if your modem is malfunctioning or improperly installed then dialing will be impossible. Follow the procedure below to see if your modem has been installed properly and is able to communicate with Windows.
Unfortunately, providing instructions on fixing your modem is beyond the scope of this technical support. The following step by step instructions are only meant to identify if your modem is experiencing problems, at which time you should have a professional fix your computer.
Open the Control Panel.
Double click on Modems icon: 
Switch to the Diagnostics tab.
Select the Port for the modem
Click on the More Info... button.
Normally, a window appears displaying responses from modem. See example below and notice how commands have responses in the white box. If you experience this, then your modem is installed properly and communicating with Windows. This does not rule out damage to the modem, but before swapping the modem, see what other possibilities exist to solve your problem.
If your computer says Port already open, then most likely another application is using your modem, such as a fax program. This could also be an indication of an improperly installed modem. Regardless, this is definitely a source of problems and should be fixed prior to attempting to use DialupAtCost service.
If any of the following errors occur, then you must contact a computer professional to have them fix your computer prior to using DialupAtCost service
Open the Control Panel.
Double click on Phone and Modem Options.
Switch to the Modems tab.
Select the modem, and then click on the Properties button.
Switch to the Diagnostics tab.
Click on Query Modem button.
If any errors occur then you will have to contact a computer professional to fix your computer. Normally the computer should respond by filling in the Command Response section. If the Command Response section remains empty after clicking on Query Modem, this again is an indication that you should contact a computer professional to have them fix your computer.