Display
While the display may hide an entirely new touch technology, it's still the same display in terms of size and resolution: a 4.7" unit with a resolution of 750 x 1334 pixels (that's 326ppi). It's a LED-backlit IPS LCD screen with RGB matrix.
The Apple iPhone 6s display offers deeper blacks than the iPhone 6 but unfortunately, it's not as bright at its maximum setting. Nevertheless, the new generation of iPhone managed to output an overall better contrast ratio of 1481:1.
The color rendition of the screen is generally accurate with a pretty low average deltaE of 3.6 (for the primary colors plus black and white), and it's the white and reds that show a somewhat higher deviation. The white is slightly on the cooler bluish side, but nothing major and certainly not noticeable without a reference.
As usual, display colors are a matter of personal taste and perception so if you don't need calibrated color output, you will probably be quite happy with the Apple iPhone 6s screen as it is out-of-the-box.
| Display test | 50% brightness | 100% brightness | ||||
| Black, cd/m2 | White, cd/m2 | Black, cd/m2 | White, cd/m2 | |||
| 0.17 | 207 | 1230 | 0.61 | 740 | 1213 | |
| 0.10 | 148 | 1542 | 0.36 | 536 | 1481 | |
| 0.14 | 163 | 1145 | 0.49 | 596 | 1219 | |
| 0.00 | 208 | ∞ | 0.00 | 473 | ∞ | |
| 0.00 | 172 | ∞ | - | 410 | ∞ | |
| 0.15 | 175 | 1180 | 0.44 | 534 | 1221 | |
| 0.00 | 152 | ∞ | 0.00 | 398 | ∞ | |
| 0.09 | 108 | 1240 | 0.43 | 532 | 1238 | |
| 0.07 | 89 | 1372 | 0.32 | 450 | 1398 | |
As far as sunlight legibility is concerned, the slightly lower brightness of the iPhone 6s outs a whisker lesser score than its predecessor, the 6, but it's still among the top 20 devices in our all-time chart. This means the contrast in direct sunlight remains excellent in all cases.
Sunlight contrast ratio
Battery life
The iPhone 6S is equipped with a non-removable Li-Po 1715 mAh battery, which is about 5% smaller than the one of the iPhone 6. iOS 9 introduced a Low-Power mode, which you can enable manually and should save your phone from dying faster once the charge drops below 20%.
We were eager to see how the new features will affect the battery life, especially when the battery unit got even smaller. The iPhone 6s posted very balanced score across all of our tests - it can do about 10 hours of 3G calls or video playback on a single charge, while you can browse on Wi-Fi for half a day.
So, the total ratting of the iPhone 6s is 62 hours - an hour better than the iPhone 6. This means 62 hours is how long a single battery charge will last you if you use the iPhone 6s for an hour each of telephony, web browsing, and video playback daily. Such usage pattern is of course entirely artificial, but we've established it so our battery results are comparable across devices.
Our proprietary score also includes a standby battery draw test, which is not featured in our battery test scorecard but is calculated in the total endurance rating. Our battery testing procedure is described in detail in case you want to learn more about it.
Connectivity
The Apple iPhone 6S comes with a bunch of wireless connectivity features. It supports faster LTE Cat. 6 (up to 3000Mpbs down, 50Mbps up) and has even wider LTE coverage. Regular 2G and 3G connectivity is all safely covered as well with a multitude of supported network bands.
The iPhone 6S also supports the latest Voice over LTE (VoLTE), HD Voice and Wi-Fi calling protocols, but those are carrier dependent features so not everyone will enjoy them.
Compared to the iPhone 6, the 6S now upgraded Wi-Fi functionality too - it supports all the current Wi-Fi a/b/g/n/ac standards but doubles the theoretical speeds thanks to the use of a 2x2 MIMO antenna. AirPlay is the only way to wirelessly cast your screen's contents to an HDTV, but you'd need to have an Apple TV for that.
Additional local connectivity includes Bluetooth 4.0 LE. There is also support for NFC, but its functionality is only limited to Apple's region-restricted Apple Pay.
The iPhone 6s uses a proprietary Lightning connector for wired data transfers and charging.
There is no support for USB On-the-go or USB host but you can pair a Bluetooth keyboard to the phone should you need this sort of peripheral.
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