How to unlock an AT&T iPhone 4 to work with TMobile?

I need a step by step process how to unlock and at&t iphone to work with tmobile. Free please.

Go to ATT. Ask them to unlock your phone. Done.

Well if it's off contract iphone, go to https://www.att.com/...Type=tech# and ask their support for info.
They will ask you for IMEI code, (which can be found in settings/general/about). Hope it helps!

The best option is to use a permanent carrier granted unlocking, you can read more information about this topic in the following article: http://www.fastgsm.com/en/page/how-to-unlock-iphone

If your iPhone is no longer in contract with AT&T, you can ask them you unlock it for you. First thing you need to find is the IMEI number. You will find it in the setting>general>about or simply dial: *#06#. The nest step is you have to contact AT&T via the phone, email or in person; tell them your iPhone is out of contract. Give them your email address; this is where they are going to sen further instructions. You have to wait for the email, backup your iPhone and restore it in iTunes. However, if it still is contract and you really want to unlock it, you can seek help at attiphoneunlock.net/unlock-iphone/ where IMEI code is the only thing you will be needing to have your iPhone unlocked.

There are plenty of reputable sites that offer factory unlocks like www.iphoneunlockedcheap.com who will do it or you can try your carrier. There are also jailbreaks but they are not permanent and are risky.

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