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When Was the First Smartphone Invented? - How-To Geek
Smartphone - Wikipedia
IBM created the world's first smartphone 25 years ago
Who Invented Smartphone? Unraveling the History of Mobile …
The Brief History of Smartphones - ThoughtCo
Smartphone History: From the First Smartphone to Today
First Smartphone: Fun Facts About Simon | TIME
World's first 'smartphone' celebrates 20 years - BBC News
The IBM Simon: The World's First Smartphone - YouTube
The First Smartphone - CHM