What’s Important Enough to Be Visible?Because there’s not a lot of space on mobile screens, not everything can be visible in a mobile UI. This makes mobile design challenging. Unlike the desktop where big screens allow us to squeeze in every feature and function on screen, mobile requires us to make decisions: what’s important enough to be visible on mobile?
Answering that question requires an understanding of what matters to your users and business. In other words, it requires good design.
Source: LukeW | Obvious Always Wins