Make sure that your modem is dialing 1 and the number. If there is still a problem than switch to netzero, it's works, fast and they really only charge your acc 14.95.
I can not access Netscape Internet Services from any of the dialup numbers, but I can get into Netscape using another ISP and access my account on Netscape that way using the same information I used on the dialup. Netscape support is completely worthless.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic