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Smartphone - Wikipedia
The Brief History of Smartphones - ThoughtCo
The history of cell phones: A decade-by-decade timeline - Android Authority
The IBM Simon: The World's First Smartphone - YouTube
Smartphone History: The Timeline of a Modern Marvel - Textedly
When Was the First Smartphone Invented? - How-To Geek
A history of mobile phones and smartphones - BBC Bitesize
World's first 'smartphone' celebrates 20 years - BBC News
Smartphone History: From the First Smartphone to Today
The First Smartphone - CHM