Incompatable Roaming Data Base for Cingular??

[Guest jminor]

today Cingular told me that the 5600 would not work on their network at some unspecified time in the future. Reason is the AT&T phone's ROM would have an incompatable Roaming Data Base to pick up updates on Cingular tower locations. This would occur even though the phone is unlocked and currently works on Cingular. What does anyone know?

[Guest shortcut3d]

As far as I know, GSM standard is the networks are maintained on the SIM card. OTA SIM update would not depend on the ROM of the phone.

The SMT 5600 does work with the 64K SIM too!

[Guest martin]

I think the Cingular guy has might have got this wrong. The SMT5600 should work on the Cingular network or any other network (in the world) that has GSM 850, 1800 or 1900 band.

I expect, at some point, that Cingular will cease roaming on their network with an AT&T branded SIM but this simply means that you will have to request a Cingular SIM as a replacement. It will probably be the same for all the other AT&T subscribers.