Elephant's texting

http://news.yahoo.com/s/ap/20081011/ap_on_re_af/af_kenya_texting_elephants

This news link is the full story about the Kenyan Elephant texting. Here is a brief summary.
Elephants sometimes left their reserves and roamed into towns, sometimes destroying cropsduring the harvest. This took a huge toll on farmer's incomes and could wipe out six month's worth of income at a time. The elephants had also sometimes caused death or injusry to people in the towns.

So a SIM card was placed in the collar of the elephant. (Side note: If you have AT&T ot Tmobile, the SIM is the removable card that is usually placed below the battery, it is pretty much what determines your phone number, and what makes the phone able to call, text etc.) A virtual geofence was made using GPS (which was a replica of the conservatiory;s boundaries), and a text is sent from the SIM to the ranger in charge of the conservatory, when the elephant gets near the fence. The ranger is then able to steer the elephant back to its reserve.

This also helps save the elephants which is an endangered species, and are also liable to be attacked because of the harm they cause when they roam into the towns.