The phone number you are dialing might not be working. Try one of the following:
Select a different phone number in the phone book
If there is not a toll-free number in the list, you might need to make a long-distance call. After you have signed up, your Internet service provider will give you a local access number to gain access to the Internet, if one is available.
Edit the phone number in the dialing error screen
The phone number must appear exactly as it will be dialed. If necessary, add a number (for example, 9) to get an outside line, add 1 to dial a long-distance number, or add a country code or area code.
Change how the number is dialed
Did any of these solutions fix the problem?