The Cell Phone (English Homework)

I am going to write about my wonderful invention what I call "cell phone" or "mobile phone". I invented it one day when i was in the street and i needed to talk with my mother and there was not a telephone there. And I thought that it was a great idea to design telephone that you can take everywhere you go. And I told my idea to a company and they thought it was really interesting and started the mobile phone project.