The Apple iPhone X's most anticipated feature is, of course, the 5.8" AMOLED screen with HDR video support and 1125 x 2436px resolution. The resulting pixel density is 458ppi - a flagship one for sure.
The screen has a rather unusual ratio of 19.5:9, taller even than Samsung's 18.5:9.
Looking at the AMOLED under a microscope revealed a very familiar Diamond PenTile matrix, the same we know from a bunch of Galaxies.
But before we continue with our screen tests, let's address the elephant in the room - the screen size. Apple claims the X has a 5.8" screen... except it's not what you may imagine this to be. You can see on the official site that the 5.8" measurement is for a rectangular screen while the X has rounded corners. But that's a minor quibble; the bigger issue is that there's a cutout at the top of the screen, which limits the usable area.
In fact, ignoring the top portion leaves a screen that's just about 18.5:9 in aspect ratio. If you were to show 16:9 content on it - the traditional widescreen format that all TV shows and YouTube videos use - you're left with what is effectively a 4.96" screen. That's obviously bigger than the iPhone 8's but way smaller than the iPhone 8 Plus display.
Finally, if we do some math for the entire screen surface area, we'd end up with the fact that the iPhone 8 Plus has a marginally larger surface area than the iPhone X.
In short, the iPhone X offers a screen that's theoretically almost 5.8" big, but in reality, it's as big as that of the 8 Plus, though content will have to fit with margins which make it feel more like the screen on the iPhone 8.
This aside, Apple's new AMOLED screen has HDR video support and is capable of True Tone adjustments. That's an automatic white balance correction enabled by a new six-channel ambient light sensor. Once turned on, the True Tone algorithm will correct the white balance according to the ambient light and thus make the picture more comfortable and easier on the eyes. That's completely different from the blue-light filter called Night Shift.
Apple promises a maximum brightness of 625 nits, and 1,000,000:1 contrast ratio. We measured 679 nits of brightness with the slider at the far right, which is even more than promised and quite possibly the brightest OLED screen we've seen.
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The Apple iPhone X aced our sunlight legibility test and posted an excellent contrast ratio beating all other phones including all Samsung phones with AMOLED screens.
As far as the iPhone X screen color accuracy is concerned, the screen offered one of the best in the business with an average DeltaE of 1.9 and a maximum deviation of 2.9. Few phones are as good or better than this (the iPhone 8 Plus being one of those). But the amazing thing is that the display gets to keep such level of accuracy even when you start lowering the brightness all the way down to 1.9 nits.
The iPhone X is equipped with a non-removable Li-Po 2,716 mAh battery - about the same capacity as the iPhone 8 Plus. The Low-Power mode, which you can enable manually, should prolong your iPhone X battery life once the charge drops below 20%.
The iPhone X ships with a sluggish 5V/1A wall charger which will replenish only 20% of a dead battery in a 30-min charging session.
We also tested the iPhone X on a Qi-compatible Samsung wireless fast charger - it recharged 17% in 30 mins.
The phone supports fast charging through USB-C power delivery, you just need to buy the proper cable (USB-C-to-Lightning, $25), and use a compatible charger from a MacBook, Pixel 2, or even a USB-C port on a Mac or PC. This way you will be able to charge 45% of an empty battery in half an hour.
Perhaps the best way to get better charging speeds on the new iPhones remains using a 12W iPad charger. It's quite more reasonably priced than the 29W MacBook charger and it already comes with a Lighting cable included. It's only marginally slower than the MacBook charger because the iPhone can only charge with 15W of power at most.
Charging hurdles aside, the iPhone X posted balanced scores across the board - it can do about 19 hours of 3G calls, 9 and a half hours of web browsing on a single charge, or you can watch videos for about 12 hours. The standby endurance turned out above average and thus the very good endurance rating of 74 hours isn't a surprise.
The X scored similar scores in the 3G call and standby tests as the iPhone 8 Plus but lagged about 3 hours behind the 8 Plus in video playback and web browsing. This means the AMOLED screen is more power hungry than the LCD unit on the iPhone 8 Plus.
Our endurance rating denotes how long a single battery charge will last you if you use the Apple iPhone X for an hour each of telephony, web browsing, and video playback daily. We've established this usage pattern so our battery results are comparable across devices in the most common day-to-day tasks. The battery testing procedure is described in detail in case you're interested in the nitty-gritties. You can also check out our complete battery test table, where you can see how all of the smartphones we've tested will compare under your own typical use.
The Apple iPhone X support LTE Cat. 12 (up to 600Mbps down, 150Mbps up) and covers an impressively wide range of LTE bands. Regular 2G and 3G connectivity is all duly covered as well with a multitude of supported network bands.
The iPhone X also supports the latest Voice over LTE (VoLTE), HD Voice and Wi-Fi calling protocols, but those are carrier-dependent features.
Naturally, the latest Wi-Fi and Bluetooth 5 standards are supported as well.
There is also support for NFC and thanks to iOS 11's new Core NFC API, the reader's functionality works for NFC tag reading besides Apple Pay. The iPhone X supports reading any NDEF formatted tag but only within an app, which can read and take action. This last requirement makes us doubtful whether this also means the iPhones will now be able to make use of the NFC-assisted pairing to various wireless peripherals and accessories, which Android users have been enjoying for ages. Unfortunately, we didn't have one handy to try it out, but we'll update this section when we grab hold of more info.
The iPhone X uses a proprietary Lightning connector for wired data transfers, charging, and audio. There is limited USB Host support - you can attach some certified accessories or access your digital camera storage via proprietary adapters sold separately. You can pair a Bluetooth keyboard with the phone should you need this peripheral.
There is no 3.5mm audio jack on board the phone, but you can use the provided Lightning-to-3.5mm adapter to continue using your favorite pair of wired headphones with the iPhone. Or go for wireless headphones.