Last updated on March 25th, 2023
References:
- https://www.britannica.com/technology/telephone
- https://www.loc.gov/everyday-mysteries/item/who-is-credited-with-inventing-the-telephone/
- https://www.bt.com/about/bt/our-history/history-of-telecommunications/1605-to-1911
- https://talkroute.com/a-little-history-fun-facts-about-phone-numbers/
- https://www.nena.org/page/911overviewfacts
- https://worldpopulationreview.com/country-rankings/911-by-country
- https://simpletexting.com/where-have-we-come-since-the-first-smartphone/