Background: I've owned most of the iPhone models and just upgraded my iPhone 5 to the 6 (I wanted the 6+, but they didn't have any left - I'm still debating whether I'll return my 6 and try to score a 6+). Like a lot of people, I like to use my phone one-handed. I'll use it in landscape mode for watching videos, taking/viewing photos, and I could see a scenario where it might be preferred for in-car use (but more apps would need to support it better). But, most of the time, I'm using it in portrait mode, and I'd like it to work well one-handed. Well, as we know, the phones are bigger now, and it's harder to do that. It's not just with the 6+. The regular 6 is also harder to use one-handed. Even going from the 4-series to the 5 made things a bit harder. Reachability is a nice feature which I suspect I'll have to use for clicking on links at the top of a web page, etc. But it should *NOT* be the long-term solution for accessing icons on the top row of the app launcher, being able to swipe down the notifications screen, clicking on buttons at the top of apps, etc. I foresee a lot of smart developers figuring this out on their own and we'll see a lot of apps get updated so that all of the buttons will get moved to the bottom of the screen. And developers who were slow to support the left-to-right swipe to go back to the previous screen will finally update their apps to do that. But I'm very concerned that Apple has not led the charge and completely rethought the UI for this new world of large-screened phones. Examples: - Top row of icons on the app launcher out of reach - Swiping the notifications screen down out of reach - Too many official Apple apps have buttons at the top of the screen (e.g., 'Send' button when composing an email, URL box in Safari). So what can be done? Well, here are some simple ideas that I think would go a long way: 1) Redefine the UI standards so that all buttons on a "menu bar" move to the bottom of the screen. The top of the screen should ideally be for information-only. This applies not just to a single row of buttons, but also when you've got lots of buttons. For example, the keyboard is on the lower part of the screen where we can easily reach it one-handed. But the phone numeric dialer takes up most of the screen, so hitting the #1 key is less comfortable. The numeric dialer buttons should be compressed a bit and moved down to the bottom half of the screen. 2) Move the notifications swipe-down screen and integrate it into a single swipe-up control panel / notifications screen. 3) The app launcher should ideally be rethought altogether, but a simple/easy improvement short-term could be to have the app launcher have apps gravitate to the bottom, instead of being top-justified, or to allow users to position app icons wherever they want on the screen. 4) Lists (e.g., contact list) should allow for some extra white space at the top of the list so that you can drag the list down and easily reach the top items. 5) Lock screen functionality needs to be revamped. When listening to audio, the controls are too high on the screen. Also, notifications which allow swiping left-to-right to jump into that app (e.g., an SMS message) are more uncomfortable to reach/swipe. Maybe change that functionality so that you now tap-and-hold on the notification to launch the Messages app? 6) Move alert banners to the bottom of the screen. Any other thoughts/ideas? Also, does anyone know how the Android and Windows Phone UI's compare in this regard? They've been doing big-screen phones longer, and I'm curious if they suffer similar one-handed usability problems, or if their UIs are already better optimized for this.