Where do i go in a mall to unlock my iphone?

I have an iphone 4s at&t and need to get it unlocked at a mall in maryland. What store do I go to to get it unlocked?

To a barber shop? Really?

I do have a iPhone 4s locked to AT&T. I didn't go to any mall to unlock it. You don't have to waste time searching for a mall. You can Unlock your iPhone from your home using internet.
I used Online Remote Unlocking Service to unlock my phone using
http://www.simpleunlocking.com/apple-iphone-4s/rs16wp9/.
They will remotely unlock your iPhone 4s after getting information of your Country and Current Network in use.