Is there a iOS 6.0 unlock for iPhone 4?

The Firmware and Modem Firmware is all updated, but AT&T is pissing me off, so I want to unlock it for TMobile

If you need to unlock your iPhone 4 locked to AT&T network, You can try with remote unlocking service. This method of unlocking is very safe and simple. You can get the remote unlocking service for an iPhone 4 from http://www.wickedunlock.com/apple-iphone-4/rs11wp9/ at affordable cost. This method of unlocking doesn't require a jailbreaking too.
Here are the steps for unlocking an iPhone 4,
1. Wait for 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.

Go on ebay find a trustful seller. You can get it FACTORY UNLOCK for cheap! FACTORY UNLOCK use it anywhere in the world and never afraid of update iOS or firmware!

I got several iphones unlock by the seller. Work perfect and fast.(iphone 4, 3gs… Yes work on new ios 6 too)
(link below)

Forgot to tell you if you're ATT customer, you can request them to unlock it for you for free!

My friend unlocked his iPhone through this website: http://officialappleunlocker.com/
their price was about $25, so cheap in comparison to some others there. They unlocked my friend's iPhone in 12 hours. They just got imei # and unlocked it.
take a look at their website.

Factory unlock supports all baseband and iOS version. I unlocked mine At&t iPhone 4 from third party. Hope they will help.