Username or EmailPassword
As an ex-user of Psion PDA's and Nokia 9000-series Communicators I'd have to agree. There is simply no decisive changeover point between a "featurephone" and a "smartphone".
For may years now even basic phones have played media files, browsed the internet, taken pictures, and run "apps". The move from dedicated PDAs and phones towards single units was not "revolutionary" but rather a gradual process that began in the early 1990s, many years before ~either~ Apple or Samsung were making smartphones.
My point, the line between PDAs, basic phones, smartphones, and other devices has always been thin and gray.