don't call just whistale

Like most kids on the tiny island of Gomera ,11 years old Maria Garcia has her own cell phone .But another form of communication -one that doest require batteries-is just as common among the children of the mountainous island .It’s known as El Silbo, the Gomera whistle . El Silbo is actually a simple kind of the language . by shaping a finger like the letter U and putting it in one side of the mouth , the islanders are able to produce a set of six whistle sound. Using those sounds to form words and sentences , they can communicate with people as far as 2.5 km away.
Now that’s something you can’t do anywhere else in the world.

for more information ,open these sites :
http://www.youtube.com/watch?v=PgEmSb0cKBg&feature=related
http://www.youtube.com/watch?v=VJleFNqQ32M