I liked the image of the 'Samsung before and after iPhone'. It isn't too much of a stretch that before iPhone there was no or limited touch interfaces and needing the use of a keypad. After iPhone you had touch enabled OS's, which obviously have no need to a physical keypad, how different can you make what is essentially a rectangular screen and nothing else?
I had a Motorola A1000 three years before the iPhone came out.
Exact same shape.
Touch screen only.
Multitasking OS.
Native apps installable from anywhere.
I used to have it playing Amiga chip mods and SID tunes on the train to work whilst web browsing and checking email and my son used it to play emulated Sega Megadrive games.
I really do fail to see what was so "revolutionary" about the iPhone.