What software should I use to unlock iPhone 3G 32g?

I see a little line but I do not trust anyone! I spend a good dollars to get my iPhone and I do not want to screw it up.

if your iPhone 3G on firmware 3.1.3, there are no tools to unlock Currently, iPhone 3.1.2 and if stay you can try this first tool of choice Blackra1n, and here, step by step http://forum.pandaapp.com/topics/17/200911/03/1327 guide, 1.html

How to Unlock 05.11.07 3.1.2 iPhone 3G and 3Gs FULL TUTORIAL!

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