$500 entry level price, same as the highest end model, just had lower amount of storage. Truly revolutionary even though it was the most expensive mainstream phone at the time. Todays Apple can't even give you that level of parity on a $1,000 phone. Making them two different sizes and keeping the best features exclusively for the most expensive one.
They also ushered in an age where a huge number of the population is suffering from a serious cell phone addiction problem because they are so cool. And we haven't even seen what the kids who grew up on this stuff will do when they get in charge. That'll be fun.
Today $500 gets you an iPhone 11, not sure how many years old that is, but it looks like it's the best value since any newer iPhone with that large of a screen costs hundreds more. But compared to the SE that means an extra inch of screen costs you an extra $100. Nice.