Comment by detaro

The iPhone opened up the smartphone market to many many more people.

We had smartphones before, but it didn't need to convert their tiny userbase to be a success (and I know some people who stuck with PocketPC-based smartphones for quite a while, because they had their use cases and workflows on them that other smartphones took time to cover).

Once the smartphone for everyone was a category, it was much more fighting between platforms than grabbing users that weren't considering a smartphone before. And after the initial rush that takes much more time to convince people to swap, and obviously app support etc is directly compared. (e.g. for me personally, Nokias Lumia line looked quite interesting at some point. But I wasn't the type to buy a new phone every year, by the time I was actually planning to replacing the Android phone I had it was already clear they'd stop supporting Windows Phone)