Microsoft Windows guides for setting up a Dial Up Network connection for accessing the Internet. Guides for Win 3.11, 95/98 and XP are kept for historical completeness.
Connecting to the internet via Windows 10 is quite straight forward.
Windows XP is now an old operating system but this guide may still help.
As of August 2010 about 1% of site visitors were still using Windows 95/98/98SE.
Early 1999 was the last time I was asked to install dialup networking on a Windows 3.11 machine. So... It is not expected that there will be many, if any, Windows 3.xx machines still in service, however... Yes, software is still available to do it :)