Siemens A31 vs Samsung Galaxy S21 Specs Comparison

Availability

Officially announced
Nov 24, 2005	Jan 14, 2021
Prices (MSRP)
	$800

Design

Dimensions
4.01 x 1.81 x 0.69 inches 102 x 46 x 18 mm	5.97 x 2.80 x 0.31 inches 151.7 x 71.2 x 7.9 mm
Weight
3.00 oz (85.0 g)	6.03 oz (171.0 g)
Materials
	Back: Plastic Frame: Aluminum
Resistance
	Water, Dust; IP68
Biometrics
	2D Face unlock, Ultrasonic in-screen fingerprint
Features
Soft keys
Keys
	Right: Volume control, Lock/Unlock key
Colors
	Phantom pink, Violet, Gray, White

Display

Size
	6.2-inch, 86.06% screen-to-body
Type
STN	Dynamic AMOLED, 120Hz, HDR, 1300 nits
Resolution
128x128px	2400x1080px, 20:9 ratio, 424 PPI
Colors
65 536
Protection
	Corning Gorilla Glass Victus

Hardware

System chip
	Snapdragon 888 (5 nm)
Processor
	Octa-core 1x2.84GHz Kryo 680 3x2.42GHz Kryo 680 4x1.80GHz Kryo 680
GPU
	Adreno 660
Memory
0.0015GB	8GB (LPDDR5)/128GB (UFS 3.0) 8GB/256GB
Storage expansion
	not expandable
OS
	Android (13, 12, 11)

Battery

Type
820 mAh, Li - Ion	4000 mAh, Li - Polymer
Charging
	Qualcomm Quick Charge 2.0, USB Power Delivery, Samsung Adaptive Fast Charging Qi and Powermat wireless charging, Reverse wireless charging
Charge speed
	Wired: 25.0W Wireless: 15.0W

PhoneArena Battery Tests

Battery Life Estimate

Untested

Browsing

Untested

Video

Untested

Gaming

Untested

Battery Life Estimate

4h 28min

Browsing

7h 47min

Video

7h 36min

Gaming

7h 9min

Learn more on our PhoneArena Battery Test Results page

Camera

Rear
	Triple camera
Main camera
	12 MP (OIS, PDAF) Aperture size: F1.8 Focal length: 26 mm Sensor size: 1/1.76" Pixel size: 1.8 μm
Second camera
	12 MP (Ultra-wide, Autofocus) Aperture size: F2.2 Focal Length: 13 mm Sensor size: 1/2.55" Pixel size: 1.4 μm
Third camera
	64 MP (Telephoto, OIS, PDAF) Aperture size: F2.0 Focal Length: 29 mm Sensor size: 1/1.7" Pixel size: 0.8 μm
Flash
	LED
Video recording
	8K UHD (24 fps), 4K UHD (60 fps), 1080p (240 fps), 720p (960 fps) OIS, HDR, Hyperlapse, Continuous autofocus, Video light, EIS
Front
	10 MP (PDAF, HDR) Video capture: 4K UHD (60 fps)

Connectivity & Features

Bluetooth
	5.0
WLAN
	a,b,g,n,ac,Wi-Fi 6,dual-band MIMO, Wi-Fi Direct, Hotspot 802.11 a, b, g, n, ac, ax
USB
	Type-C, USB 3.2
Sensors
	Accelerometer, Gyroscope, Compass, Hall (for flip covers), Barometer, Ambient light sensor, Proximity sensor
Hearing aid compatible
	M3/T3
External antenna
Yes
Location
	GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning
Other
	NFC, ANT+

Multimedia

Headphones
	No 3.5mm jack
Speakers
	Earpiece, Multiple speakers
Features
	32-Bit DAC, Dolby Atmos, aptX, Dolby Digital, Dolby Digital Plus

Cellular

5G Bands
	n2, n5, n12, n25, n41, n66, n71, n77, n260, n261, SA, NSA, Sub-6, mmWave
4G (FDD) Bands
	1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 66, 71
4G (TDD) Bands
	38, 39, 40, 41, 46, 48
3G Bands
	1, 2, 4, 5, 8
Other
Other version supports GSM 900/1800 MHz
Data Speed
	LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s, UMTS
SIM type
	Nano SIM

Phone Features

Notifications
Polyphonic ringtones (32 voices), Vibration, Speakerphone

Regulatory Approval

FCC approval
Date approved: Mar 15, 2006 FCC ID value: PWX-A31A	Date approved: Dec 08, 2020 FCC ID value: A3LSMG991U
Measured SAR
Head: 0.44 W/kg Measured in: 1900 MHz Body: 0.95 W/kg Measured in: 1900 MHz	Head: 0.36 W/kg Body: 1.08 W/kg Simultaneous Transmission: 3.96 W/kg Wireless Router: 1.09 W/kg Phablet: 2.49 W/kg

Alternative variants

with 256GB storage

Memory	256GB

for Europe

System chip	Samsung Exynos 2100 (5 nm)
Processor	Octa-core 2900 MHz 1x2.91GHz Cortex-X1 3x2.81G​Hz Cortex-A78 4x2.2G​Hz Cortex-A55
GPU	Mali G78 MP14
Weight	5.96 oz (169.0 g)
5G Bands	SA, NSA, Sub-6
FCC approval	Date approved: Dec 18, 2020 FCC ID value: A3LSMG991B
Measured SAR	Head: 0.42 W/kg Body: 0.94 W/kg Simultaneous Transmission: 3.96 W/kg Wireless Router: 1.34 W/kg Phablet: 2.37 W/kg

Links

Full specifications
Siemens A31 Specs	Samsung Galaxy S21 Specs
PhoneArena Review
	Samsung Galaxy S21 Review
User Reviews
	Samsung Galaxy S21 User Reviews