The Note 4's sound detector can be used to pick up on a doorbell or a ring tone. This feature is accessed through Settings > Accessibility > Hearing > Sound Detectors.
You simply record the sound of your door bell, buzzer or the ring tone or another device, so that when you're using your Note 4 with headphones, it will tell you when it hears that sound. No more worrying about missing the buzzer if a friend comes over when you're in the middle of watching a movie. To get a caller summary, just go to Dialer > Settings > and check Show Caller Information. Go to Dialer > Settings > Call > and make sure Show Caller Information is checked. When someone calls you, your Note 4 can provide you with a quick summary of your recent activity with that person, as well as pertinent information such as an upcoming birthday, the last time you spoke to them or the contents of their last SMS to you. This feature has a mild creepy factor but a high cool factor.
Get an activity summary of anyone calling you The only downside is that it won't preview all links. You'll also get a notification that the feature is available if you hover over a link without the setting enabled. Just go to Settings > S Pen > Air View and flick the switch. It's a huge time saver and very simple to activate. If you don't quite want to commit to launching the browser every time someone sends you a link, you can use the S Pen's hover function to preview the URL without actually opening it. Long-press in the camera app to activate spot-focus and auto-exposure. This makes taking photos on a bright day or in high contrast situations a lot easier to manage. You know how you can tap the screen in the camera app to focus in a different place? If you long press instead you'll not only change the focal point, but you'll also set the exposure automatically for that area. This is one of the best camera features to have on any phone, but surprisingly few people know about it on the Galaxy Note 4. Use auto-exposure adjustment when you focus Multi-task like a madman with the Note 4's pop-up apps feature. Just long hold the back button to open a side-scroll of apps, which you can then tap to open in a pop-up window. You can move them about individually, resize them and shrink them to little bubbles to regain access to any fullscreen apps.
The feature allows you to open up to five windows that float over anything happening full-screen. You can really make the most of the Galaxy Note 4's screen size by using pop-up apps. Use pop-up apps if you're a keen multi-tasker Smart stay keeps the screen on as long as you're looking at it. To activate Smart stay, go to Settings > Display and wallpaper and press Smart stay. This is great if you want to have a short screen timeout but also do a lot of reading on your phone. So long as you're looking at it, it remains on. Smart stay uses your phone's front-facing camera to detect whether you're looking at the screen or not. Use Smart stay when you're reading to stop the screen turning off The reduced screen size feature makes one-handed operation possible. To activate the feature, go to Settings > Display and wallpaper > One-handed operation and select Reduce screen size. Now, wherever you are on the phone, you can simply swipe left and right quickly from midway up the right side of the screen to enable a smaller screen size. Thankfully, Samsung has included a helpful feature that temporarily shrinks the screen to a more manageable size, and all it takes is a simple gesture. The Note 4's large screen is great for many reasons, but it is impossible to reach across it with your thumb, as you would on a smaller device. These tips will make the Galaxy Note 4 even better.