I don't know if anyone else has considered another very important factor: Internal antennae.
Think about it. Even if you could enable the chip's 1700mhz capabilities via a modified modem.bin, the Note doesn't likely have antennae designed or tuned for that band, so either you won't get any signal at all, or if you do, it would likely be very poor anyway.
Sucks, I know...
However, there may be some light at the end of the tunnel. Now this is purely speculation, but considering the roaming agreements that AT&T and T-Mobile now have as a side effect of their failed merger, it's possible that future devices from both carriers will be made to be compatible on both networks. So here's to hoping that the AT&T Note will have baked-in support for AWS1700!
It has been proven that the GN7000
is hardware-compatible. I registered on this site just to post this. The GN7000 has the proper radio, as well as a menu for selecting the proper frequencies.
The issue is that the modem.bin needs to be rewritten, not the hardware.
The first post here has links with a teardown revealing that the proper radio for pentaband
is there.
I understand why there might have been some confusion, as the menu for activating the frequency had been found some time ago, but there was no direct proof of the radio supporting the correct frequencies.
However, second of all, has anyone thought about the upcoming ATT GNote supporting their 'LTE frequencies'. Correct me if I'm wrong, but that means that it WILL have 1700/2100 MHz radios for the LTE use.
It will also have the same processor (and likely radio) as the T-mobile GSII.
Could someone confirm that if the radio supports these bands that we're in business?
There might be at least some purpose of getting an ATT Gnote after all...