Short for 'satellite phone'; a communication device that is mightier than the more common cell phone which every 5 year old chick now has.
These phones communicate with satellites in space using an abnormally large antenna instead of those ugly towers that have sprung up everywhere in the past couple of years.
Satellite phones are typically larger and more rugged than the ordinary mobile phones that peasants use. They are also more expensive to use and are known for their poor battery life.
They don't work so well inside buildings and are therefore unpopular with urbanites who would rather settle for a piece of shit iPhone but are an essential part of daily life in the backarse of nowhere.
Some douche called my satphone to bitch at me for hitting on his girlfriend. The call cost him so much he's filing for bankrupcy now.