I have the Delorme inReach which is sort of like the spot. My partner got it for me because I am frequently out of cellphone range when geocaching in the back woods. It uses satellite communication rather then cell. You can send text messages from it, or, if you get hurt you can send an SOS and it sends your geographic coordinates directly to emergency services on a schedule until you are found. You can also set it to send your location to a map on a webpage that someone has acccess to. I send mine every 10 minutes when out.