The device features a 4.99-inch a 1080P HD super AMOLED display (1920 x 1080) with 441 pixels per inch, a Samsung Exynos 5 or Qualcomm Snapdragon S4 Pro processor, depending on the region, a poly-carbonate case (white or black), 2GB of LPDDR3 RAM, Android 4.2.2 (Jelly Bean), a 13-megapixel camera on the back which can shoot more than 100 shots in four seconds, which you can then select and composite into a single frame, allowing you to get rid of annoying photo bombers. On the front is a 2-megapixel shooter, and the device supports wireless charging.
The device also comes with 802.11ac Wi-Fi (which also runs on the normal a/b/g/n bands), Bluetooth 4.0, and Cat 3 100 / 50 Mbps LTE, and also comes with an IR blaster. The Galaxy S4 will come in 16/32/64GB options with a microSD slot (up to 64GB) and be available in 3G and 4G.
On the software side the Galaxy S4 features the rumoured Samsung Smart Scroll and Pause, the former allows you to scroll by just moving your eyes and the latter automatically pauses playing videos when you look away from the phone. With the cameras you can record video with the back camera and front camera at the same time, even in video calls. You can also record sound when you take a photo, which samsung says "adds another level of detail to memories."
The company has also added special sensors in the Galaxy S4, such as a built-in pedometer for tracking the number of steps you walk or run. Other sensors in the phone even allow you to measure the ambient temperature and humidity of a room you're in, with that data going into the S Health app. Diet tracking is also here, with the app being able to pull in information from its database of foods. S Health can also sync with blood pressure monitors and glucose meters over Bluetooth. Samsung is also brining an S Band accessory into the mix, a pedometer bracelet that tracks you when you aren't carrying your Galaxy S4, the data can be synced once you have your device.
Additionally on the software side, Samsung's new S Voice Drive optimises voice commands when driving, WatchOn lets you use your phone like a remote, Optical Reader lets you scan business cards and then lets you use actions like calling a number or translating text and touch-free gestures allow you to hover your finger over the screen to pull out contextual data or preview the content of messages, control features like scrolling, music and more.
Samsung is also introducing the S View Cover, which looks like Samsung's flip cover for the S III, however a cutout reveals a small section of the S4 screen that shows the time and notifications. Oh, and you can also use the phone with gloves, much like the Nokia’s Lumia 820 and 920.
The phone will launch on 327 mobile operators in 55 countries starting at the end of April.