World cell phone use

For house exchangers, cell phone usage is very important. We couldn't travel without our cell phones and the gps that comes with it.All thanks to wifi. We have to work on the carriers who, for some reason, charge us extra when we are out of the oountry. Yet the world is uptodate on this issue. 97 percent of the world's population has a cell phone, according to Wikipedia. In America 3 percent have more than one cellphone it seems because 103 percent of the population has cell phones, according to Wikipedia. What is wifi? Satellites carry our data and our voices. Pictures take a lot of data. Movies even more. But written text and voice do not take much data. That's why we can get instant messaging and, in some cases, phone calls for free. The heavy use of data otherwise subsidizes it.