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The first mobile phone
The Motorola DynaTac was the first ever commercially produced smartphone. http://historythings.com/the-history-of-the-cellphone/ -
A much smaller cell phone
The motorola MicroTAC was very small phone and was the first flip-phone
https://www.washingtonpost.com/news/the-switch/wp/2014/09/09/the-history-of-the-mobile-phone/ -
First ever smartphone
The IBM Simon was made in 1992 and was the first phone to have additional features to just calls. http://historythings.com/the-history-of-the-cellphone/ -
The iPhone
Steve Jobs introduced the iPhone which had several advancements over other phones before it. https://www.washingtonpost.com/news/the-switch/wp/2014/09/09/the-history-of-the-mobile-phone/