The correct answer to this open question is the following.
In recent years it has become harder to fully participate socially and economically in American society without having a smartphone. Some might even consider them a requirement for being able to live with dignity in our society. This would be an example of how what is considered a necessity is socially defined and can change over time.
The smartphone is the invention that changed the lives of people in modern times. It is an example of how technology can create new necessities. Today, it is unthinkable that people do not use the smartphone for many purposes in their daily lives. It has been used in the workplace, for communication purposes, and is dominant in its use for entertainment purposes.