FixedPhone

21 century is here they introduce iphone3gs yes apple inc they really work hard to together to achieved this aim.let me get to the point how to unlock iphone3gs by yourself is not a big deal you too can do it i will tell you the step to do this .
Note this how people unlock smartphone  in computer village but some phone are by unlock device.

step1 check you phone IMEI number the phone it usually at the back the phone or dial *#06# 

step2 go to the phone website search foe the phone model or search google Eg unlock G1

step3 click on unlock phone and will ask for the imei number of the phone input the code correctly

step4fill out the necessary form they requested

step5 most site accept credit card to accomplished this task use your credit card if you don't have you can used your gtbank atm card most site accept it.

step6 before 24hrs they will get back to you with the code that will dial to unlock the phone input the code and your phone is completely unlock
Note ,always check if the website is fully protected make sure that the security label tag is there before input your details  .