World's first 'smartphone' celebrates 20 years - BBC News
World's First Smartphone Simon Launched Before iPhone
Different Types of Mobile Phones and Smartphones | TL Dev Tech
What Was The First Smartphone? - YouTube
Smartphone History - The First Smartphone | SimpleTexting
The History of the Cellphone
Smartphone innovation in the third decade of the 21st century | MIT Technology Review
Smartphone | Britannica
IBM created the world's first smartphone 25 years ago | World Economic Forum
The smartphone is turning 25: here's how far it's come -- Verdict
Smartphone - Wikipedia
Google, Apple, Samsung, BlackBerry: Cellphones that no longer exist
A (Mostly) Quick History of Smartphones - Cellular Sales
On the Origin of the Smartphone – Product Evolution
The invention of mobile phones | Science Museum
The rise of the smartphone: Mobile technology in the 2010s
The smartphone is turning 25: here's how far it's come -- Verdict
Who invented the first smartphone? What is the evolution of the smartphone? - Quora
Cell phone history: From the first phone to today's smartphone wonders
On the origin of the smartphone - FifteenEightyFour | Cambridge University Press
Mobile phone - Wikipedia
World's First Smartphone Simon Launched Before iPhone
The history of smartphones: timeline | Smartphones | The Guardian
iPhone throwback: The original 2007 iPhone started the smartphone revolution | Mobile News
History of mobile phones | What was the first mobile phone?
