Tech review of Samsung Galaxy S21 SM-G991

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Yurii Rodionov

Author, Content Specialist

Experienced tech specialist

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Main and additional circuit boards

Samsung Galaxy S21 SM-G991

Side 1

Spare parts

and components

Battery

tech-review-of-Samsung Galaxy S21 SM-G991

Cameras

Earpiece speaker

Cable

NFC tag

Sub-board

Vibration motor

Features

Type Smartphone

OS Android 11

SIM type/size Nano SIM + eSIM

SIM Dual SIM / Single SIM

Dimensions 151.7 x 71.2 x 7.9 mm (5.97 x 2.80 x 0.31 in)

Weight 169 g (5.96 oz)

Display

Display type Dynamic AMOLED

Size 6.2 inches

Resolution 1080 x 2400 pixels, 20:9 ratio

PPI density 421

Protection Corning Gorilla Glass Victus

Multimedia

Main camera 12 MP / 64 MP / 12 MP

Main camera Video 4320p, 24fps

Front (selfie) camera 10 MP

Front (selfie) camera Video 2160p, 60fps

Audio MP3, AAC, WAV, WMA, FM-radio

Headphone jack Mini jack 3.5 mm

Network

Technology GSM/3G/4G LTE

Bands Yes, Band 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 38, 39, 40, 41, 46, 48, 66, 71

Interfaces Wi-Fi 802.11ac, Bluetooth 5.0, NFC

Satellite navigation GPS with A-GPS, GLONASS, BDS, GALILEO

Processor and Memory

System on a chip Samsung Exynos 2100

CPU Octa-core 1x Cortex-X12.9 GHz + 3xCortex-A78 2.80 GHz + 4x Cortex-A55 2.2 GHz

GPU Mali-G78 MP14

Internal memory 256 GB

RAM 8 GB

Card slot No

Battery

Battery capacity Li-Ion 4000 mAh

Charging port USB Type-C 3.2

Battery model EB-BG991ABY

Other

Announced 2021, January 14

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Evgenii Kuzmin

Senior maintenance service and repair engineer

Based on our experience, we made a selection of the most common malfunctions of mobile devices and evaluated the difficulty of performing repairs for each of them. The final evaluation of the difficulty of the repair is the sum of all the parameters. This difficulty rating is also applicable for all models Samsung Galaxy S21 SM-G991 released for markets in different countries.

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