You don't get to define "smartphones" to fit your pet theory, especially when your experiential data with those phones you say did not have "appreciable' 3rd party apps, your criterion for these phone's exclusion, seems to have been made up out whole cloth by YOU, based on no first hand evidence. Instead, you choose to bestow your blessings on a platform every contemporaneous user hated, Microsoft Mobile, and declare it a "smartphone", when most users of the product would laugh you out of the room!
Incidentally, your source article at Wikipedia claimed both the BlackBerry and the Nokia N series to be the pre-eminent smartphones of the period prior to the intro of the Apple iPhone. . . . when you in your FOLLY chose to exclude them to obfuscate and advance your pro-Android agenda!
Smartphone means-—
That in addition to it being a cellphone. That you can access the internet with it. That the internet sites and your emails will display in a coherent way.
Aside from the above, the camera features coupled with large image display area, plus ability to instantly transmit these photos (and stoopid selfies) have boosted “smart” phone sales