Hi, I have been doing a lot of research to try and understand if I can buy a used ATT i747 S3 to use with my t-mobile 4G. I got nowhere so hopefully someone here could help me! Thanks in advance! I would like to buy a used galaxy s3 to use with my t-mobile 4g. I understand that the bands of the ATT i747 are different than for the T999 s3 version, and i747 has LTE were T999 does not. But doing some research I thought I found a way of making the i747 run 4g on t-mobile with only some simple setting changes. I found an ulocked i747 s3 and I tried to change the settings on the phone to make it work on 4g. It did not work, it only showed 2g Edge with horrible browsing speed. I live in Long Island NY 11731 and my current Nokia Lumia 710 was showing good 4G signal. I have two questions please, so far… 1. Will an ATT Galaxy s3 i747 will work on t-mobile 4g or should I buy T999 only? 2. Will it still be worth buying the i747 over an T999 because in the very near future t-mobile will have the true 4g LTE in my area? Thanks in advance for all your help!