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

What has happened in those 45 years?

Currently, the number of people who use mobile phones is more or less?

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

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

What are the reasons that have influenced the use of mobile phones?

What factors mainly determine the production costs of mobile phones?