Since it emerged that the AT&T Galaxy Note's hardware supported T-Mobile's HSPA frequencies, there's been a cash bounty out for anyone able to bring Tmo 3G and '4G' connectivity to the device. Now it may be time for someone to collect that reward, as a method involving copying over parts of radio firmware from other devices has resulted in success.
The method, discovered by hacker 'Tomin.FHL,' requires users with rooted, SIM-unlocked AT&T Notes to download and flash specific parts of a radio file from another phone through ClockworkMod recovery. And that's pretty much it. Though obviously you'll well and truly void your warranty in the process, which means you'll be on your own if something goes wrong (like, say, bricking your phone because you flashed a hacked radio onto it).
Over on XDA, various forum members have tried the hack with varying levels of success. The general consensus seems to be that it works, though you can expect slower HSPA data rates than you'd get on an officially-sanctioned Tmo device. If you're understand the risks, you'll find more info over at the source link.