I'm not sure what a page even means anymore. There are some works that may only be available electronically, especially if they are on the shorter side. In that case the page size would be dependent on the Kindle or phone model, etc.
I read ebooks on my phone. While I could use page-like navigation, I find it more comfortable to just scroll down to keep the text I'm currently reading in roughly the same screen area. The only concept of a page that's left in that situation is the transition between chapters.