A question has been plaguing me this holiday season.  GAIT phones use
the ESN to authenticate with AMPS/TDMA, and the IMEI on the SIM to
authenticate with GSM.

Well, interesting thought.  If I activate a SE T62u on a national GAIT
plan, then take that SIM out and put it into a GSM phone, and put some
kind of "dummy" SIM (one that was disconnected), would the GAIT phone
function?  Since I am sure that the IMEI could not be authenticated over
TDMA, what would the outcome be?

I notice that my voice memos are stored on the SIM, as they follow me
from phone to phone.  I am also confident that IRDB's for both TDMA and
GSM are stored on the SIM.  If a discontinued SIM was placed in the
phone, how would the TDMA system know the difference?  The T62u allows
you to select TDMA Only or GSM Only modes.

I don't plan on trying this, but it's an interesting thought, isn't it?

==AD