> Before iphone mobile phones were running Java applets, which were sometimes even compatible across different phone manufacturers and users even could exchange them over infrared.

"Sometimes" doing a lot of heavy lifting.

Nokia had an app store, and before you could see the available apps you have to first choose your phone: because even with-in Nokia's own product range there was so much variation in screens, keyboards, and general capabilities that they had to pre-apply a filter to show you what would actually work.