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Smartphone - Wikipedia
The Brief History of Smartphones - ThoughtCo
When Was the First Smartphone Invented? - How-To Geek
Smartphone history - The first smartphone - SimpleTexting
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
The history of cell phones: A decade-by-decade timeline - Android Authority
Smartphone History: From the First Smartphone to Today
The First Smartphone - CHM