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Smartphone - Wikipedia
Smartphone history - The first smartphone | SimpleTexting
When Was the First Smartphone Invented? - How-To Geek
The Brief History of Smartphones - ThoughtCo
Who Invented Smartphone? Unraveling the History of Mobile …
Smartphone History: The Timeline of a Modern Marvel - Textedly
IBM created the world's first smartphone 25 years ago
A history of mobile phones and smartphones - BBC Bitesize
World's first 'smartphone' celebrates 20 years - BBC News
The First Smartphone - CHM