How to make my att iPhone 4 work on tmobile network?

I have prepayed plan with AT&T I wanna switch to t mobile so I can have unlimited data which AT&T doesn't provide for iPhones how can I get the phone unlocked

Your intelligence level is really showing up now.

did it ever occur to you to look up your? On google, or are you just lazy brained like 80% of the other young generation here that can't and won't think for themselves.

learn to use your mind and seek out your own answers in life dude.

Mr.cancer goon, Lmao what a name

To use the AT&T iPhone 4 with T-Mobile, you need to Unlock the carrier lock of the iPhone 4.To unlock the Carrier lock you can use Remote Unlock Method which is safe, easy and permanent unlock solution. You can get the remote unlock service for reasonable price from http://www.prounlocking.com/apple-iphone-4/rs16wp9/. There you have to give your Country and current network name along with your IMEI number to get Remote Unlock Service.
Note: For phones purchased in USA on or after 26 January 2013, please contact your network/service provider and get their permission to unlock your phone.