How to unlock my iphone 3gs?(AT&T)

javiergame4
javiergame4 Posts: 2
edited May 2014 in iPhone Forum
I'm new to this, but i'm very computer literate so I need help. I need to unlock my iphone 3gs for my dad, but i'm not sure how to deactivate it first. Which program to use to deactiviate it, then my understanding is, after i do that, I go to the at&T website and request for the unlock code, is that right?

tldr; I need to unlock this iphone 3gs(At&T) where do i start?
I heard you do it by using the IMEI number or something..

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