How to unlock iphone 4 5.1.1 on baseband 4.12.01?

I need help! Does anyone know how i can unlock my iPhone 4 version 5.1.1 on baseband 4.12.01 i've tried everything but it doesn't work please someone help me

Only the original carrier can unlock that, if the iphone is off a 2 year contract.
i have a factory unlocked one for sale or trade.email me if your in PA

Hi you can unlock your iPhone 4 through remote unlocking method. This method of unlocking is very safe and simple. You can get the remote unlocking for your iPhone 4 from http://www.wickedunlock.com/apple-iphone-4/rs11wp9/ at affordable cost. This site is a legit source to rely on accurate unlocking solutions at affordable cost.
Here are the steps for unlocking an iPhone 4,
1. Wait for us to send you an email saying your phone has been activated or remotely unlocked.
2. Install the latest version of iTunes.
3. Make sure your Apple iPhone 4 phone software is updated to the latest version using the iTunes software.
4. Connect your Apple iPhone 4 to iTunes with a NOT ACCEPTED SIM card.
5. Wait until iTunes detects your Apple iPhone 4.
6. Disconnect your Apple iPhone 4 and reconnect it after 10 seconds.
7. Your Apple iPhone 4 is now unlocked.