This is a detailed step by step on how to revirginize your iphone.
Why would you want to do it you ask?
well it depends, if the if you have unlocked your iPhone using anysim1.0.2 and now with the new 1.1.1 unlock out you want to upgrade your iPhone to 1.1.1 and then unlock it again you will not be able to.
as the story goes anysim changes your iPhones programming in a way that if you were to upgrade to 1.1.1 without virginizing it would brick it.
so therefore using this guide you can first revirginize your phone which means bring it back to its initial locked factory condition,
then upgrade your iphone to 1.1.1,
and then unlock it.
now beware that this is a very lenghty and complex procdure so unless you absolutely want to upgrade your iPhone to 1.1.1 do not use this guide and instead wait a few months for the one step 1.0.2 re-virginizer.
http://maxupload.com/5491BF25