I have the Sprint "Free and Clear America" plan. In Arizona, especially the more rural areas, Sprint does not have coverage, but I know some of the older 800 mhz CDMA systems work.

The few times I've seen my T600 loose service, it picked up Sprint within a few seconds.

So when the T600 looses service, how long does Sprint service need to be non-existant before it goes into Roaming, checking both 1900 and 800 systems? Does the other carrier show up in the top right instead of Sprint?