You can always buy a GSM850 phone from a third party reseller like GSM Phone Source. Many of the new higher-end Motorola phones are quad-band, as are pricier things like the Trio 600 or 650. T-Mobile does offer the Motorola V600 as well as the newer A630. Both are quad-band from the factory, but I've read that T-Mobile "disables" the GSM850 support, but that reflashing the firmware restores the functionality. Or something weird like that. The sorts of places that you can read about it (e.g., HowardForums) are so full of noise and so lacking is clue, that it's hard to know the extent to which these stories are true.