The SIM in my Treo is the same one that came with my Treo 180 some 4 years ago. It says PACBELL on it... that's how old it is .

My Treo wants to default to the 'Pacbell' GSM network (which obviously do NOT have EDGE based on my bandwidth tests), and only switches to the "new" AT&T/Cingular towers when Pacbell is not available.

My old Siemens GSM phone had the ability to set a preferred network list. I can't find any way to do that on the Treo.

Any ideas? Should I just go down to the Cingular store and get a new SIM?