I’d argue that a good mobile browser was the killer app that brought the iPhone to the forefront. It differentiated it from what else was available at the time.

I’d argue that a good mobile browser was the killer app that brought the iPhone to the forefront. It differentiated it from what else was available at the time. It’s hard to pinpoint a killer app now because the ecosystem is mature, but a killer app is often what gets a platform off the ground in the first place.