Yup! You read the title correctly. You can, with a little hacking, make the Samsung Galaxy Note work on T-Mobile’s 4G (HSPA+) network. This process is a bit involved and is not recommend for the causal user. You can risk bricking your device if something were to go wrong in the process.
Here is what you need to achieve this: a rooted, and unlocked Galaxy Note, an active T-Mobile SIM card with a data plan attached.
You should be running the most current version of the Saurom Projekt Team ROM with the popular Clockwork Mod custom recovery. Download the the modem profile from the XDA Developer thread here. Place the downloaded file onto your SD Card and reboot your device into CWM. Flash the downloaded file to your device and reboot your device. When the device reboots, it will now be ready to work on T- Mobile’s network.
There are some things to note. The data speeds on the Galaxy Note are not as fast with the native 4G devices sold by T-Mobile. Also, signal strength is reported to be weak and download speeds are capped at the 5Mbps range.
You can also check out RootGalaxyNote for a video tutorial and more information about this.