I think all of you will appreciate how a current tracking system works:
http://www.xora.com/timetrack/flash_demo.html
Just enter your info
and you'll get a demo. It's long, but from the
first menu you can skip to the part on location tracking. It's talks
about the little GPS "breadcrumb trail" but my favorite section was
the "Exception Reports" and what happens if a user displays "unavailable
time."
Now you wouldn't really need a PHONE to do this, but a single RFID
device that could get pinged off of about any type of RF/net-connected
gateway already out there: celltowers, hotspots, wal-marts own rfid
tracker, other stores/kiosks, etc.
I would think the cellphones themselves could eventually do this for any
RFIDs nearby and boost those back to the closest tower.
Yep, this technology is here right now. But, sure, let's have the naysayers
chirp that I need to roll up in my tinfoil sleeping bag and take my meds.
"Don't agitate the dots"