How to unlock jail broken iPhone 4S on 5.1.1?

With baseband 2.0.12? Please, anyone know how to do this? Thanks! I tried following a video showing how to doubt thru SAM but it failed.

Sam no longer works… The original carrier can unlock if your a customer off a 2 year contract.

After we unlock your iphone http://attiphoneunlocker.com/ connect to itunes with a non accepted sim (for example a tmobile sim) and do a back up and restore. Your phone can now be used with any gsm network. You can safely update the OS on your handset at any time, and sync your device with your computer without fear of Apple removing your unlock
We provide an AT&T Official, Permanent, Apple unlock that remove any network restrictions your iPhone may have by marking your handset as unlocked in Apple's IMEI database.
Once your Unlock has been processed just follow these simple steps:

1) Open iTunes on your Mac or PC (verify you have internet connectivity).

2) Connect your iPhone to your computer using the USB data cable.

3) Backup and Restore your iPhone using iTunes.

4) Once your iPhone is restored it will have the Factory Unlock in place!

http://attiphoneunlocker.com/faq/

  • What will happen if I use itunes with a jail broken Iphone? I have an Iphone 3s which was recently jail broken via a system called cydia in China. I haven't clicked on the cydia app yet i only jail broke it so i can put my Australian sim card in it. When i connected my iphone with itunes it attempted to 'restore' but i unplugged it. So what will happen to my phone if I connect it to itunes? Will it corrupt it? Full details please! btw i paid for some guy to jail break my phone so i have no idea about cydia
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  • Jail broken sprint iPhone 5? Ok so I know the jail brake for the iPhone 5 is coming out, so I have a T-mobile plan and I've recently got an sprint iPhone5 basically my question is will I be able to use my T-mobile service on the sprint iPhone 5 since the jail brake is coming. Will I need to buy one of those chips that go into the SIM card tray such as the r-sim7?