how do I protect my Apple iphone 3G against virus’ while surfing the internet?

I am looking for firewall, spyware, general anti-virus and probably most importantly a site advisor software (compatible with safari) just like the thousands of software available on a PC or Mac. Please recommend some anti-virus software designed for the Apple iPhone 3G and tell me where to download it and add in your personal exp. using it if possible. If your going to copy and paste a link, please tell me specifically how it will help me, as I am short on time and don’t want to spend my time reading through irrelevant stuff.

iPhones don’t get viruses and Apple has to approve every single app before it goes on the store. Don’t be a freaking idiot who lacks any ounce of common sense. “DUH YA WINDOZE GET VURISES SO DAT MEEN EVEN CALCULATER AND SELL FONE GET VURIS TWO~~`~!!!!!111″

Free Apple iPhone