How to unlock my iPhone 3GS on iTunes?

How do I unlock my iPhone 3GS on iTunes?

Added (1). I got a new phone which has recently broken so I'm returning to my iPhone 3GS for a bit until I get my new phone fixed. However, seeing as I haven't used this phone in 9 months, I don't remember the passcode. Is it possible for me to use iTunes to reset the passcode on my iPhone without restoring? This is purely because I know the newest IOS doesn't work so well on the older phones and I really don't want to have to ruin it. Any advice?

Use an older version of itunes to restore to 6.1.2 or 6.1.3. If your willing to put in a bit more work you can use Redsn0w.

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