Incredible AT&T Wireless Snafu
a little ludwig goes a long way: ATT phone obsoleting. For those of you who have been wondering why AT&T GSM coverage is so horrible. Ludwig explains it. Basically, AT&T launched their GSM in the 1900 MHz range, but then built out their older 850 MHz TDMA spectrum, so now they really need phones that are dual band (1900/800MHz) to really work effectively.
Of course that means that you really want the newest AT&T phones only. Sigh. What a mess.