3rd April, 1973 was a cool spring day in New York City. People were walking in the street when they saw a man with a large ____ in his hands. He was ____ it next to his ear and he was talking. The man was Martin Cooper and he worked ____ Motorola. He was talking to Joel S. Engel, who worked for a ____ company. Engel was sitting ____ his desk when his phone rang. ‘Joel, this is Marty,’ said Martin. ‘I'm calling you from a ____ phone, a real hand-held portable cell phone.’ This was the first ever public mobile phone call. The mobile phone Martin Cooper used was very ____ from smartphones today: It ____ 1.1 kg and it was 23 cm long. It only made phone calls. The battery lasted only twenty minutes. Today, most smartphones weigh 100–200 grams. They have a ____ screen, they can ____ to Wi-Fi, you can talk for ____ and charge them with a portable charger. There are ____ for everything you want to do. You can even choose a different ____ for each of your friends and family!

4.5 The phone call that changed our world forever!

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