Subject: is "The Evolution of Mobile Phones (Cell Phones)

" The first generation of mobile phones was introduced by Motorola 45 years ago.

1. What has happened in those 45 years?

2. Are there more or fewer people using mobile phones today?

3. In other words, has the use of mobile phones become popular or not?

4. In general, are mobile phones more expensive or cheaper? Why?

5. What are the reasons that have affected the use of mobile phones?

6. Which factors mostly determine the production costs of mobile phones?