How to Unlock My IPhone 3GS Mobile.

[SVSPradeepKumar]

Hi,

My cousin purchased Iphone 3G -(AT & T) in USA last year.

while updating OS, phone is locked but he purchased as unlock mobile.

Right now i am using the unlock mobile by using Jailbreak .

My Concern is : how to unlock my Iphone... because i need to upgrade my IOS from 4.1 to 5.1.1

Please reply me...

Email ID# solletipradeep2008@gmail.com

Thanks,