By default the port number is 2221 but it can be easily changed from your phone's settings. For security reasons, anonymous access is not activated by default, but you can also change that in your settings screen.
The great thing about the Wifi FTP Server app is that it lets you easily transfer files from your Android to your PC without having to connect them using a cable. However, you do need an FTP client previously installed on your computer.
Wifi FTP Server is a really interesting app that lets you easily and painlessly turn your smartphone into an FTP server.