Hi Joe,
Another option to consider is the SPOT Satellite Messenger. This could
potentially take care of your coverage issues although I've had issues with
messages getting lost in space. The SPOT has a tracking mode where you can
tell it to send location coordinates every 10 minutes to an email address.
We actually integrated it with our system and you can read about it here:

http://blog.ublip.com/archives/spot-satellite-messenger-and-web-based-gps-tracking/

I realize it's not a cell phone, but it does address the coverage issues
that David mentioned.

Regards,
Dennis

-- 
Ublip, Inc - Location Matters
www.ublip.com
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