anyone have any clue if this upcoming "SpareOne" device would work using the Tracfone system? (ie: do tracfones even have sim cards?)

we live very remotely with little-to-none cell reception, so cell phones are fairly worthless, except when we travel. we own a tracfone we take with us in saddlebags or truck for emergencies.

for $100/yr it has come in handy a couple of times over the last ten years. we even recently upgraded to a never model phone for $15 because the old battery wouldn't hold a charge anymore.

problem has always been that when we go to use it after a few weeks or months, the battery was often dead, so this 1xAA unit seems like just the answer we need.

suggestions/comments/ideas?