If designers want to create effective mobile UIs, they need to know the differences each app has, its features, and the way users interact with them. There are no longer any standards in relation to the type of screens that work for each app because the mobile industry is evolving so quickly. More importantly, designers must be flexible, and adaptable, and modify the way they think about mobile design based upon not only emerging technologies, but also user expectations, which means continuous improvement and modifications based upon numerous iterations, revisions, and learning from user experience. In this light, much of the mobile experience will also consist of an evergreen state of learning from users, and designers will need to be open to changing their approach.