Well I say that in anticipation of some sort of carrier update that could get around the "fix". Wouldn't it be great if AT&T enabled MMS but in the same carrier update they disabled tethering (if that's even possible of course).
All of you who now have tethering unlocked, will notice that your visual voice mail does not work anymore. You either get tethering or visual voice mail. I don't recommend doing this trick to unlock tethering. That is just me though.