Xiaomi MI 8 128 GB Specifications, Tests and Review

Display
6.21", 2248 x 1080
Front Camera
20 Megapixel
Main Camera
12 Megapixel
Operating System
Android 8.1 Oreo
Storage
128 GB
RAM
6 GB
Processor
Qualcomm Snapdragon 845
Battery
3400 mAh

Other Variants:

Complete technical specifications, details, expert ratings and review of Xiaomi MI 8 128 GB. Find out how your chosen phone stacks up against the competition and whether it's the one that best meets your expectations with the phone comparison feature.

DESIGN AND DIMENSIONS Xiaomi MI 8 128 GB
Product Type Smartphone
Form Factor Touch
Height 154.9 mm Better than 77 % of phones rated.
Width 74.8 mm Better than 78 % of phones rated.
Depth 7.6 mm Better than 93 % of phones rated.
Weight 175 g Worse than 74 % of phones rated.
Body Colour Black | Blue
Body Material Glass, 7000 Series aluminium
Waterproof (Water-resistant) -
SAR Value 1.662 W/kg (body), 0.701 W/kg (head)
Connector Type USB Type-C - 24 pin USB-C
SIM Card Type (Size) Nano SIM
SIM Card Qty Dual-SIM

The Xiaomi MI 8 128 GB has a height of 154.9 mm, a width of 74.8 mm and a thickness of 7.6 mm. The weight of the phone is 175 g.

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DISPLAY Xiaomi MI 8 128 GB
Display Type OLED display
Display Technology AMOLED
Screen Size (Display Size) 6.21" Better than 81 % of phones rated.
Screen Resolution (Display Resolution) 2248 x 1080 pixels Better than 81 % of phones rated.
Display Format Full HD+
Pixel Density 402 ppi Better than 53 % of phones rated.
Aspect Ratio 18.7:9
Max Brightness 600 cd/m²
Contrast Ratio 60000:1 Better than 56 % of phones rated.
Display Enhancement Technology Sunlight mode
Display Features Always-on display, Reading mode, Colour temperature adjustment, DCI-P3 Wide colour gamut

The screen size reaches 6.21" inches. With a large display, phone offers a great experience for watching videos, playing games and reading. The best phones today are 6.5'' or more. They have the advantage of a large display area that allows you to see more content than with conventional display sizes. Owing to OLED technology, the display offers a true representation of colours, especially black. The resulting contrast is significantly higher and colours appear more vivid. OLED technology is now part of most smartphones, while LCD displays are becoming a thing of the past in mobile phones. OLED displays also have lower power consumption compared to LCD technology.

Display Resolution of Xiaomi MI 8 128 GB is 2248 x 1080 pixels. A higher display resolution is a prerequisite for a sharper image. The standard for mid-range phones today is a Full HD resolution of 1920 × 1080 px. Cheaper phones, which usually have a smaller diagonal, have an HD resolution of 1280 × 720 px. Smaller resolutions can only be found in older models. Best phones, on the other hand, have a 4K resolution of 3840 x 2160 px. Display´s pixel density is 402 ppi and represents another significant factor affecting image sharpness besides resolution. The higher the value, the sharper the image. Average value is currently about 350-400 ppi, which guarantees a fine and sufficiently sharp image. Finest modern phone displays reach 450 ppi and above.

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PROCESSOR Xiaomi MI 8 128 GB
Processor Type (CPU) Qualcomm Snapdragon 845
Clock Speed 2.8 GHz Better than 95 % of phones rated.
Processor Core Qty 8-core Better than 99 % of phones rated.
64-bit Architecture Yes Better than 82 % of phones rated.
Graphics System (GPU) Qualcomm ADRENO 630

Xiaomi MI 8 128 GB is equipped with Qualcomm Snapdragon 845. The number of processor cores is 8. It is a number of cores that plays an important role in evaluating the performance of phone as it is responsible for computing operations. Smartphones already commonly have a core count of around 4 to 8. Multi-core processors can perform better and reduce the processing time of a request to a minimum, which is reflected in the responsiveness of the phone, e.g. in the speed of opening applications. The processor frequency indicates how many instructions phone can process in 1 second. The higher the frequency, the better the performance. Standard processor frequency range today is between 1.8 GHz and 2.8 GHz. Xiaomi MI 8 128 GB reaches the frequency of 2.8 GHz.

The processor also includes the graphics accelerator Qualcomm ADRENO 630.

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MEMORY Xiaomi MI 8 128 GB
RAM LPDDR4X SDRAM - 6 GB Better than 89 % of phones rated.
Internal Memory Size (Storage Capacity) 128 GB Better than 90 % of phones rated.

The phone´s internal memory capacity is 128 GB. The size of the internal storage determines e.g., how many photos, songs, movies, or applications you can store on your phone. For everyday use and storing photos, songs or movies, this medium-sized internal storage is ideal. The advantage is also a lower price of phones equipped with this storage capacity. Best phones today range from 256 GB to 1 TB. That size is suitable for the most demanding users who shoot a lot of high-resolution photos or videos in 4K. Nevertheless, you'll have to pay extra for these higher capacities. Luckily, most smartphone manufacturers nowadays offer models with different memory sizes to suit every user.

RAM memory of the Xiaomi MI 8 128 GB is LPDDR4X SDRAM - 6 GB. Most powerful phones currently have an operating memory of 12 GB or more, which is especially useful for demanding users such as gaming enthusiasts. Normally, phones nowadays have 6 to 8 GB of RAM, which means that the phone can easily handle normal operation and more demanding applications. Operating memory of less than 4 GB is found in lower-end phones or older models, and they are suitable for low-end users who don't use demanding applications and have the phone more for basic use.

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CAMERA Xiaomi MI 8 128 GB
MAIN CAMERA
Number of Main Cameras 2
Sensor Resolution 12 Megapixel Better than 62 % of phones rated.
Sensor Name Sony Exmor RS IMX363 sensor
Lens Type Wide-angle lens
Lens Aperture F/1.8 Better than 80 % of phones rated.
Optical Image Stabiliser (OIS) 4-axis OIS (Optical Image Stabilisation) Better than 87 % of phones rated.
Focus Adjustment Automatic
Special Effects HDR
Camera Modes Burst mode, Panorama, portrait mode, AR Emoji, AI Beautify
Face Recognition (Face ID) Face recognition Better than 79 % of phones rated.
Light Source LED flash
Video Resolutions 1920 x 1080 (1080p) at 30 fps, 1280 x 720 (720p) at 30 fps, Slo-mo video 1280 x 720 (720p) at 240 fps, 3840 x 2160 (4K) at 30 fps, Slo-mo video 1920 x 1080 (1080p) at 240 fps
Camera Features (Functions) Dual Pixel Autofocus technology, AI Dual camera, AI scene detection, AI Beautify, AI dynamic bokeh, AI studio lighting, AI short video editing, AI high-res photos
SECOND CAMERA
Sensor Resolution (2nd Camera) 12 Megapixel Better than 81 % of phones rated.
Lens Type (2nd Camera) Telephoto lens
Lens Aperture (2nd Camera) F/2.4 Worse than 63 % of phones rated.
Camera Features (2nd Camera) Portrait lens
FRONT CAMERA
Number of Front Cameras 2
Sensor Resolution (Front) 20 Megapixel Better than 91 % of phones rated.
Special Effects (Front) Mirror
Camera Modes (Front) AR Emoji, AI portrait mode
Face Recognition (Face ID) Face recognition Better than 92 % of phones rated.
Camera Features (Front) Self-timer, AI detection of 10 different scenes, 3D Beautify
SECOND FRONT CAMERA
Camera Features (2nd Front) Flood Illuminator, Dot Projector

The rear camera of the Xiaomi MI 8 128 GB is equipped with 2 lenses, with each lens having a different role in taking pictures. Most common lens you'll see on smartphones is a wide-angle lens, telephoto lens or macro lens. A wide-angle lens is mainly used to capture landscapes and other spatially larger compositions where a wide field of view is needed. A telephoto lens is designed for photographing subjects at a distance and often has an optical zoom. A macro lens is ideal for close-ups and small objects. The main lens is designed as Wide-angle lens. The resolution of the main lens is 12 Megapixel. Higher resolution does not necessarily mean super high quality photos. Furthermore, it depends on the pixel size but also on other important factors. The aperture of main lens reaches F/1.8 value. The best phones have a lens with an aperture of up to F/1.5, where more light can pass through sensor and photos will be of a high quality even in low light conditions. However, lenses with apertures around F/1.8 to F/2.2 are the most common. The lower the number after the slash, the better the photo quality. An undeniable advantage is the optical image stabilisation, which makes image significantly more stable without any loss in quality. Cheaper phone models are equipped with electronic stabilisation, which has a negative effect on the resulting image quality. Some users will also appreciate facial recognition feature, which allows camera to recognise the face of person in frame and automatically focus on it.

Second camera
The second lens of rear camera is designed as Telephoto lens. The resolution reaches size of 12 Megapixel. Furthermore, the second lens is equipped with aperture of F/2.4.

Front camera
The front camera of Xiaomi MI 8 128 GB is equipped with 2 lenses, with each lens having a different function when taking pictures. The resolution of front lens reaches 20 Megapixel. Again, it should be noted that resolution is only one of several other significant factors that affect resulting quality of a photo.

The facial recognition feature is just a nice cherry on top.

Second front camera
You won't see a second front lens on most smartphones yet. Having more than one front lens in Xiaomi MI 8 128 GB is thus rather exceptional in world of phones.

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BATTERY AND CHARGING Xiaomi MI 8 128 GB
Battery Capacity (Battery Size) 3400 mAh Better than 76 % of phones rated.
Fast Charging Technology Qualcomm Quick Charge 4.0+ Better than 86 % of phones rated.

The battery size of Xiaomi MI 8 128 GB is 3400 mAh. Nevertheless, battery capacity is not the only factor that affects the phone's battery life. For example - the size of the display, the performance of the processor, the use of data functions and, of course, the intensity of use of phone in general all have a significant impact on battery life. Standard for most smartphones today is a battery capacity of around 4500 to 5000 mAH. Phones with this battery size usually guarantee a phone life of at least 1 day. Older or cheaper smartphone models can then reach battery capacities typically around 2500 mAH and below. With this capacity, you may find that if you use your phone heavily, you may need to recharge your phone during the day. The fast charging function will also please many people. Owing to fast charging, phone charges up to several times faster, which you will appreciate, for example, on the go.

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CELLULAR Xiaomi MI 8 128 GB
Technology CDMA2000 1X / GSM / WCDMA (UMTS) / TD-SCDMA
Mobile Broadband Generation 4G Better than 88 % of phones rated.
Operating System Android 8.1 Oreo
User Interface MIUI 9.5
Payment Technology Android Pay
Navigation GPS, GLONASS, BeiDou, Galileo, QZSS

Xiaomi MI 8 128 GB supports 4G. 5G connectivity, which is slowly replacing standard 4G connectivity, is still more the preserve of the latest phones. The operating system in this case is Android 8.1 Oreo. This model also offers ability to pay by phone with Android Pay.

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COMMUNICATIONS Xiaomi MI 8 128 GB
Data Transmission GPRS, EDGE, EV-DO, HSDPA, HSUPA, HSPA+, FDD-LTE, TDD-LTE
2G Band 850 GSM, 900 GSM, 1800 GSM, 1900 GSM, 800 CDMA2000 1X, 1900 CDMA2000 1X
3G UMTS Band Band 1, Band 2, Band 4, Band 5, Band 8
3G UMTS Frequency 2100, 1900, 1700, 850, 900
4G LTE Band Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 17, Band 20, Band 34, Band 38, Band 39, Band 40, Band 41
4G LTE Frequency FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 700a, FDD 700b, FDD 800 DD, TDD 2000, TDD 2600, TDD 1900, TDD 2300, TDD 2500
Wireless Interface IEEE 802.11a/b/g/n/ac
Bluetooth Bluetooth 5.0
NFC Yes Better than 66 % of phones rated.
Messaging Services SMS, MMS

Fans of modern technology will appreciate NFC function, which allows, among other things, contactless mobile phone payments, but also finds other uses in connectivity, such as unlocking the door or loading the menu in restaurant using the NFC tag. Basic connectivity standards also include Bluetooth 5.0, making it easy to communicate wirelessly with other devices such as headphones, tablets, speakers and smartwatches.

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MEDIA Xiaomi MI 8 128 GB
Supported Digital Audio Standards WAV, AAC, PCM, AMR, MP3, FLAC, AAC +, eAAC+, APE (Monkey's Audio), apt-X, AMR-WB, AMR-NB, apt-X HD
Supported Digital Video Standards MKV, XviD, MPEG-4, H.264, M4V, HEVC, H.265, ASP
FEATURES Xiaomi MI 8 128 GB
Phone Functions Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert
Sensors Accelerometer, ambient light sensor, proximity sensor, digital compass, barometer, gyro sensor, hall sensor, Time of Flight (ToF), infrared (IR) sensor
Security Devices Face recognition, fingerprint reader
Security Technology IR face unlock
Additional Phone Features Face Unlock, MU-MIMO technology
OTHERS Xiaomi MI 8 128 GB
Included Accessories Power adapter, SIM card removal tool, USB-C to 3.5 jack adapter, USB-C cable, Mi 8 Protective cover

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