iPhone had gps and mapping and really nice full website browsing, plus bigger storage and music (since we all wanted iPod phones before then).
I’d argue one of the bigger factors in its success was that it had an unlimited data plan (which I never should have let go of).
The N75 may have had Bluetooth, the OS, and a browser, but lacked the UI to use it. It was a camera phone marketed as a smartphone because it launched right after the first iPhone.