Xiaomi has been a vendor we’ve been working with for a few years now, but never got to the point where we really wrote an in-depth article on. Today as the company is eyeing on going public with an IPO in Hong Kong and an ever increasing advance on European markets, it’s the best time to actually shine a light on one of the company’s latest flagships – the Mi MIX 2S.

The Mi MIX 2S is actually a successor to last year’s Mi MIX 2, which in turn was a successor to the original Mi MIX which was a pioneer design in terms of bezel-less smartphones and ahead of the curve in terms of screen-to-body ratio metrics. The original Mi MIX was meant to show off the company’s design prowess – but it actually evolved into a mass product with the MIX 2S. This year’s new Mi MIX 2S iterates on the design and updates the internals to the latest hardware.

  Xiaomi Mi MIX 2S
SoC Qualcomm Snapdragon 845
4x Kryo 385 Gold @ up to 2.80 GHz
4x Kryo 385 Silver @ up to 1.77 GHz
Adreno 630 @ up to 710 MHz
Display 5.99-inch 2160x1080 (18:9)
Dimensions 150.9 x 74.9 x 8.1 mm
191 grams
NAND 64GB / 128GB / 256GB
Battery 3400 mAh
Qualcomm Quick Charge 3.0
Qi Wireless Charging
Front Camera 5MP, 1.12µm pixels, f/2.0
Primary Rear Camera 12MP, 1.4µm pixels, f/1.8
Sony IMX363
Secondary Rear Camera 12MP, 1.0µm pixels, f/2.4 2x Zoom
Samsung S5K3M3
SIM Size 2x NanoSIM
Connectivity 43 global bands (8GB+256GB model only),
4x4 MIMO, 2.4/5G WiFi,
WiFi Direct, WiFi Display,
Interfaces USB 2.0 Type-C; no 3.5mm
Launch OS Android O (8.0) with MIUI 9
Launch Price
6GB/64GB: ¥3299 / $449 / €423
6GB/128GB: ¥3599 / $490 / €462
8GB/256GB: ¥3999 / $544 / €513 

Digging into the hardware, that’s where we see the biggest changes compared to the Mi MIX 2. The 2S sports a latest generation Snapdragon 845 SoC with 4x Kryo385 Gold/A75 at 2.8GHz paired with 4x Kryo385 Silver/A55 at 1.77GHz. I was impressed with the overall performance of the S845 in our Galaxy S9 review so I’m expecting the MIX 2S to perform no worse.

The phone comes in 64, 128 and 256GB NAND storage variants, with 8GB RAM configuration reserved for the 256GB SKU, while the smaller ones come with 6GB standard.

The Mi MIX 2S sports a 3400mAh battery which is covered by a ceramic back on which we find the fingerprint sensor as well as a very iPhone X inspired camera housing – one of the major design changes compared to the MIX 2.

Obviously the display is the defining feature of the MIX series and here we see a 5.99”, 18:9 aspect ratio IPS LCD screen with a resolution of 2160x1080. Xiaomi was indeed one of the pioneers in bringing out this type of small bezel designs out to market. Way the company achieved this is by shifting all front sensors and camera to the bottom of the phone.

The top of the phone hides a very narrow speaker grill for the ear-piece. It’s not the greatest earpiece but it does serve its purpose well, and actually acts as a second stereo speaker alongside the bottom main unit. For this review I’m trying to reintroduce audio quality evaluation, starting with speaker measurements in a section later in the article.

While the front camera positioning is generally functional, it has the large drawback that front-camera operation becomes quite cumbersome in portrait mode as most of the time it’s looking “up” to you and for right-handed people taking a selfie means sometimes covering up the camera with your thumb, an issue that can be solved by alternatively using the fingerprint sensor as the shutter button. In landscape mode (with the camera on the upper right side) this is less of an issue. In general as I think there’s vastly more right-handed people and most front-camera operation happens in portrait mode, the camera should have been put in the left corner of the bottom of the phone.

On the right side of the phone we find the volume rocker and the power button underneath.

As we mentioned earlier, one of the larger design changes compared to the Mi MIX 2 is the camera setup. The 12MP f/2.0 shooter has been replaced with a newer sensor from Sony; the IMX363 increases the pixel pitch from 1.25µm to 1.4µm and the lens also has a larger aperture at f/1.8. In addition to the main sensor we see a new secondary module with a 12MP Samsung S5K3M3 sensor with 1µm pixel pitches and an f/2.4 aperture lens with a 2x optical zoom.

At the bottom of the phone we find the USB-C port alongside a microphone and the main speaker grill. The main speaker seems to be very much downward firing, but otherwise performs adequately. There’s no headphone jack here, which is a great disappointment and what I think is a misstep for the industry as a trend.

System Performance
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  • Andrei Frumusanu - Friday, June 29, 2018 - link

    722MB/s R 243 MB/s W on 8 threads. The issue with NAND performance tests is that they're generally broken and aren't properly representative of real file system performance.
  • Pallmei - Friday, June 29, 2018 - link

    Ok, did a few AndroBench 8 threads test: average 750MB/s read 200MB/s write on Mi Mix 2. Can not quite reach 250MB/s write, but otherwise very much the same.
  • ** A - R ** - Friday, June 29, 2018 - link

    Then, how do Samsung & Toshiba advertise their Read/Write Speeds for UFS NAND ?
    Are they not Real ?
  • Andrei Frumusanu - Friday, June 29, 2018 - link

    They're real but the question is if those numbers are representative of the file system. The hardware can be fast but if the software doesn't manage it correctly it's not meaningful. Currently that's a lot more complex question.
  • Glock24 - Friday, June 29, 2018 - link

    I had a Redmi Note 3 SE that didn't resist the 10,001nth drop. The RN5 Pro for Taiwan was the only viable replacement due to network support, but was not yet available. I prefer to have SD sopport on the phone, but I finally settled for the Mi Mix2 64GB for $365. It'll arrive in about a week.
  • serendip - Sunday, July 1, 2018 - link

    A Mi Max 2 would have had the right network support and still get you MicroSD support.
  • arashi - Sunday, July 1, 2018 - link

    Mi Max series are ginomous.
  • Glock24 - Sunday, July 1, 2018 - link

    None of the Mi Max series have LTE B2/B4 that I need. Besides, those are like having a Kindle Fire as a phone, just ridiculously bug.
  • Glock24 - Sunday, July 1, 2018 - link

  • eastcoast_pete - Friday, June 29, 2018 - link

    Hi Andrei, any comments/conclusions regarding the availability of OS and security updates from Xiaomi? I never owned one of their phones, but a manufacturer's committment to keeping their phones current for the next 2-3 years is key for any purchase for me. For example, I had a bad experience with Huawei (no updates at all despite official promises) and that put me off their phones for the foreseeable future.

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