The dropping of the ##3282# code was not an AT&T thing. I've got two Lumia 920s, the unlocked ones that were given out at the Microsoft Build conference. One I received at the build conference last fall, which had issues with the first upgrade that Nokia released. It has since been upgraded to 1308 without problems. During that first upgrade, it appears they also upgraded the radio firmware, which removed or changed the ##3282# field test. Because of the problems I had with that upgrade, Nokia sent me another of the developer phones, which had not been upgraded, so I updated it to the 1308 firmware. Surprisingly, the radio firmware did not upgrade. It is an older version. The older version shows "4G" when running on LTE, while the newer version on the other phone shows "L" for LTE. The newer version also doesn't launch the field test when dialing ##3282# but the old radio does. Other than that, the other firmware components are the same. So i'm not sure why the radio firmware is no longer upgrading.