Firstly, the main purpose of using the cell phone is communication.Recently, communication tools have been very useful because of developing the smart phone.Its usefulness was surprising when I get it for the first time.Furthermore, communications are must in your life.
Secondly, today's lifestyle is turning to the one which needs the cell phone.For example, I usually take reservations of the hotel or the movie theater, and apply for something. Seemingly, it may be disadvantage not to have a cell phone.
In conclusion, there are a lot of occasions which need the cell phone, so I think it is essential.

