Visit a WAP site, using your normal PC.
No doubt, you have heard about WAP - it's included on most cellphones today. WAP is the "Wireless Application Protocol" and allows you to provide information and even run small applications on the visitor's cellphone.
Working through websites on your cellphone isn't always that comfortable, so here's link to an on-line wap emulator, by "dotMobi".
(The previous version, which could be run from our own pages, has seized to exist. Therefor, the link to dotMobi is now offered as an alternative).