The Cellphone

When did the phones became popular?

Who invented the cellphone?

Where did he grew up?

What did he studied?

When he joined the navy, he served in two ways. Name the first one:

In which other way did he served in the navy, and for how long?

In which year did he started to work in a company, and which company?

For what was he hired in this company to work on?

What did the company and him make for the police department?

How long did it take to create the cellphone after the police radios?