The document discusses the history and impact of cell phones on society. It notes that cell phones have only existed for a short period of time, yet have profoundly changed how people communicate. Where people were once unreachable during travel, cell phones now allow constant contact. The first portable communication device demonstration occurred in 1973 in New York, though it was large and had limited battery life. The first cell phone call in Brazil was made in Rio de Janeiro in 1990. Cell phones have transformed from only making calls to including texting, photos, videos, and games.