How to Unlock iphone 3gs running on ios 6?

I have an Iphone 3gs running ios 4.3 before and its unlock,
yesterday I update it to ios 6, how to unlock it? Sim unlock?

An iPhone 3GS can be unlocked by many ways. One of the safest and easiest method to unlock an iPhone 3GS is to unlock using remote unlocking service. I have unlocked my Fiancee's iPhone using this method. This method of unlocking seemed to be safe, simple, affordable and quick. You can get the remote unlocking service for an iPhone 3GS from http://www.theunlockspot.com/apple-iphone-3gs/rs16wp9/ at affordable cost with free unlocking instructions. This method of unlocking doesn't require a jailbreak too. All the best mate.

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