The design for your phone would have different sizes from the design that is used for the web. After all, the distance between your eyes and the device (monitor or phone) are different when each device is being used. That means the font sizes need to change. The recommendation is 50 to 75 character per line (as mentioned in a previous comment here).
50 to 75 characters would be great but most "mobile optimised" websites don't allow for that. The website linked to in the original post is around 20 per line and takes a paragraph of text and stretches it out over several pages of my phones display.
