An inside story told by Wayne Whitley, one of the original five inventors of the first Smartphone and other members of the design team, describing the process of creation, from concept to product, of the IBM Personal Communicator. This product was designed by IBM and marketed by BellSouth Cellular Corporation in the early 1990s and has since been credited as the world’s first smartphone.

Links:
Wikipedia – IBM Simon
en.wikipedia.org/wiki/IBM_Simon

Time First Smartphone turns 50
time.com/3137005/first-smartphone-ibm-simon/

Simonizing the PDA
byte.com/art/9412/sec11/art3.htm
Smartland Korea: Mobile Communications, Culture and Society
books.google.com/books?id=SjKNDgAAQBAJ