I recently read an article about the fact that the first mobile phone was created back in 1974 and was a Motorola brand. The battery had to be charged for 10 hours and it lasted only half an hour. I think that nowadays you can rarely meet a person on the street without a mobile phone in their hand. Today, people even work through mobile phones, and in the past they had to charge the battery for several hours for half an hour of using the same that phone. :)