How to reinstall (comppletely fresh) iPhone OS 3.1.2

Hi,
I have some issues with my iPhone and as per the instructions of my carrier, I need to reinstall iPhone OS from scratch. They offered me the service to reinstall OS but I didn't had backup of my phone and hence I want to do it at home now.
I searched a lot on this topic but couldn't find any.
Guys pls help me in reinstalling iPhone OS from scratch.
Regards,
Anand

Also be advised that you will have to sync your data back from the computer after setting up as new. This process does not include you restoring from an iPhone backup in iTunes. A brief overview of syncing your iPhone with your computer can be found here.
http://support.apple.com/kb/HT1386

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How to reinstall (comppletely fresh) iPhone OS 3.1.2

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