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The WHOLE reason the smartphone space finally took off was because Apple came in and rationalized the interaction model and implemented a robust, responsive UI.I see this "fact" thrown about all the time by under-30s who only ever knew of the iPhone since they were teens.
The iPhone OS interface, as it first existed, faithfully aped the Palm Garnet OS, which was the latest iteration of Palm's highly successful OS going all the way back to the late 90s. Before there were smartphones there were PDAs, and while it's debatable that Apple invented the PDA with the Newton, the platform didn't become a commercial success until US Robotics released the PalmPilot and PalmPilot Professional. When Handspring successfully melded the Palm OS with cellphone hardware creating the Treo, the touch controlled, icon based, modal fullscreen app "smartphone interface" as we know it was created. Palm bought Handspring and pivoted to improving the Treo line of smartphones, culminating in the Treo 600 and 700 series.
Speaking of responsiveness, while Palm's own devices were fairly standard and could be sluggish, Sony's Clie line made Palm OS feel almost as fast and fluid as the modern iOS interface. The hardware was expensive but it was the absolute best handheld computer you could buy in the early to mid 2000s. The first time I used the original iPhone I still owned a Clie NX70V, and the Clie was less jittery than the iPhone if I had a lot of apps open on both devices.
That's not even touching on Nokia's Symbian, arguably the best selling smartphone OS in history, but Symbian never resembled Palm OS, Android, or iPhone OS until after those systems became widespread.
So no, Apple never invented anything in this space; they took what already existed, polished the hardware, correctly implemented multitouch, and applied Jobs' marketing magic. I drank the Kool-aid and bought the original iPhone soon after its release. I ended up promptly selling it and going back to my Treo to get real work done when I realized the iPhone was nothing more than a (arguably excellent) mobile web browser. It wasn't until Apple finally started allowing apps (something Palm supported from the beginning) that the "modern" smartphone revolution really began. Even then, hardware improvements were driven by Android based devices, with Apple always playing catch-up.