Facebook is available on Mobile Phones and many people are using it to pock their friends and family from there. Here will will show you how your profile page will look on Nokia N70 handset. Mobile Page URL for Facebook is m.facebook.com where you need to enter your login details.
There is an emulator available on dotMobi website where you can see how your website will look on mobile handsets. Currently the options are Nokia N70 and Sony K750. They should go for iPhones for sure. I tried with my facebook account and it appears similar as it appears on original Nokia N70 phones.
After that I tried with Internet Techies mobile phone address (m.clickonf5.org) and found the same result. So if you are planning to create a website for mobile phones then try this emulator which will help you optimizing the page size and theme according to the screen size of a mobile phone.