But that would be silly, because the modern "smartphone" era was absolutely started with the iPhone.
HP OmniGo 700LX, pdQ, and Nokia 9000 Communicator didn't have touchscreens and were like night and day compared to either the Prada or iPhone. You are comparing apples to oranges.
Was it a nice industrial design? Yes. Wasn't very original though (and neither was the iPhone's).
You're also shifting the goalposts - you said smartphone, not "had a touchscreen". It was the first capacitive touchscreen but not even close to the first touchscreen btw. The IBM Simon in 1992 likely takes that win.
What the iPhone did that was innovative was in how it improved upon and combined the technology. It also pushed forward a lot of things in those technologies by several large leaps.
Long story short - the LG Prada is superficially visually similar to an iPhone and, likewise, bringing it up shows a very superficial understanding of the history of the mobile phone space.
Android, Windows phone, and iPhone all added these core features.
[1] The Hiptop used server-side rewriting of web sites to adapt them to its screen. This seems bananas now, but remember, the web was less than a decade old, and the notion of "responsive design" was years in the future. Back then, most other phones were stuck with WML.
Another issue is LG Proda stuck with J2ME instead of offering native apps.
So, the Proda was close, but it really missed the mark. IMO, the fact it took 4 years to after the hardware was possible before the iPHone showed up shows how significant the innovation actually was.