I would have said 6 or 7 if asked. It seems like a lot has happened in that 5 years.<p>The thing that strikes me about the iPhone, and everyone has their own thing, is this contradiction. For me upon it's release it was so revolutionary. It was such a massive monumental change from its closest rival (Blackberry) in the way it looked, felt and worked. Since that time though, it really has done some small iterations and changed very little. Maybe the two are directly related.<p>Now to those that will go bananas on (it hasn't changed that much) imagine someone who has never seen any of these phones. Put a 1st gen iPhone next to the comparable blackberry at the time. Then put a 1st gen next to the most recent release. Think of how different each of those two experiences would feel.