Below you can see the popular YouTube video which compares all 4 iPhone generations with each other. This inspired me to come up with my own comparison. Based on initial iPhone reaction.

Original iPhone:
“Oh wow! Is that THE iPhone? — May I touch it?”

iPhone 3G:
“Dude, is that the new iPhone? How do you like it? Worth the upgrade?”

iPhone 3GS:
” — ”

iPhone 4:
“How’s that iPhone working for you? Lots of antenna issues, huh? Sucks!”

And there you were, thinking it’d be all about the FaceTime…