
The AT&T Samsung Galaxy Note i717 can work on T-Mobile’s 4G network with some steps to root and unlock it.
You must download one of with different modems: T-mobile SGH-T989 KID, T-mobile SGH-T989 VKL1, and Telus KJ3 from here. Then, flashing the Galaxy Note via the ClockWork Mod app and reboot the device
You can follow the video below to watch all the steps:
Source: RootGalaxyNote