Samsung Galaxy A40 vs Samsung Galaxy A21s vs Samsung Galaxy A51 5G UW

General Info

Manufacturer
Samsung	Samsung	Samsung
Announced
March 2019	Expected Announcement - May 2020	August 2020
Status
Coming Soon - April 2019	Rumored	Available - August 2020
Colors
Black, White, Blue, Coral	Black, White, Blue	Prism Bricks Blue
Form Factor
Candybar	Candybar	Candybar
Dimension
144.3 x 69.1 x 7.9 mm (5.68 x 2.72 x 0.31 in)	8.9 mm thickness (0.35 in thickness)	158.8 x 73.4 x 8.6 mm (6.25 x 2.89 x 0.34 in)
Weight
-	191 g (6.74 oz)	188.8 g (6.63.0.28 oz)
SIM Type
Single SIM (Nano-SIM), Dual SIM (Nano-SIM, dual stand-by)	Single SIM (Nano-SIM), Dual SIM (Nano-SIM, dual stand-by)	Pre-installed Nano-SIM
2G Network
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only)	GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only)	GSM 850 / 900 / 1800 / 1900
3G Network
HSDPA 850 / 900 / 1900 / 2100	HSDPA 850 / 900 / 1900 / 2100	HSDPA 850 / 900 / 1900 / 2100
4G Network
LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 20(800), 38(2600), 40(2300), 41(2500)	LTE	2, 4, 5, 13, 66
5G Network
-	-	260, 261 mmWave
SAR EU
- W/kg (head) - W/kg (body)	- W/kg (head) - W/kg (body)	0.59 W/kg (head) 1.32 W/kg (body)
Messaging

Build Features
- Fingerprint Sensor	- Fingerprint Sensor	- Fingerprint Sensor (under display, optical)

OS
Android 9.0 (Pie)	Android 10.0	Android 10
User Interface
-	One UI 2.0	One UI 2.0
Processor
Octa-core (2x1.8 GHz Cortex-A73 & 6x1.6 GHz Cortex-A53), Exynos 7885 Octa (14 nm)	Octa-core 2.0 GHz, Exynos 850	Octa-core (1x2.4 GHz Kryo 475 Prime & 1x2.2 GHz Kryo 475 Gold & 6x1.8 GHz Kryo 475 Silver), Qualcomm SDM765 Snapdragon 765G (7 nm)
GPU
Mali-G71	-	Adreno 620
RAM
4 GB	3 GB	6 GB
Internal Memory
64 GB	64 GB	128 GB
External Memory
microSD, up to 512 GB (dedicated slot)	microSDXC	microSDXC (uses shared SIM slot)

Type
Super AMOLED Capacitive Touchscreen	PLS TFT Capacitive Touchscreen	Super AMOLED Capacitive Touchscreen Corning Gorilla Glass 3
Colors
16M colors	16M colors	16M colors
Size
5.9 inches	6.55 inches	6.5 inches
Resolution
1080 x 2280 pixels (428 ppi)	720 x 1600 pixels (268 ppi)	1080 x 2400 pixels (405 ppi)
Screen-to-Body Ratio
86.97%	-	87.47%
Multi-Touch

Rear Camera
16 MP + 5 MP	48 MP + 8 MP + 2 MP	48 MP + 12 MP + 5 MP + 5 MP
Flash
LED Flash	LED Flash	LED flash
Features
16 MP, f/2.0, PDAF 5 MP, f/2.2, 12mm, (ultrawide) Panorama, HDR	48 MP, f/2.0, 26mm (wide), 1/2.0", 0.8µm, PDAF 8 MP, f/2.4, (ultrawide), 1/4.0", 1.12µm 2 MP, f/2.4, (macro) Panorama, HDR	48 MP, f/2.0, 26mm (wide), 1/2.0", 0.8µm, PDAF 12 MP, f/2.2, 123˚ (ultrawide) 5 MP, f/2.4, (macro) 5 MP, f/2.2, (depth) panorama, HDR
Video
2160p@30fps, 1080p@30fps	1080p@30fps	4K@30fps, 1080p@30/120fps; gyro-EIS
Front Camera
25 MP, 1080p@30fps	13 MP, f/2.3, 29mm (normal), 1/3.1", 1.12µm HDR, Panorama 1080p@30fps	32 MP, f/2.0, 26mm (wide), 1/2.8", 0.8µm HDR 1080p@30fps

GPRS
Yes	Yes	Yes
Edge
Yes	Yes	Yes
3G
HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat12 600/150 Mbps	HSPA 42.2/5.76 Mbps, LTE-A	HSPA 42.2/5.76 Mbps, LTE-A, 5G
Bluetooth
4.2, A2DP, LE	5.0, A2DP, LE	5.0, A2DP, LE
Wi-Fi
Wi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct, hotspot	Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot	Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot
USB
Type-C 1.0 reversible connector	Yes	2.0, Type-C 1.0 reversible connector, USB On-The-Go
GPS
Yes, with A-GPS, GLONASS, BDS	Yes, with A-GPS	Yes, with A-GPS, GLONASS, GALILEO, BDS
Browser
Yes	Yes	Yes

Internal
64 GB, 4 GB RAM	64 GB, 3 GB RAM or 32 GB, 3 GB RAM	128 GB, 6 GB RAM
Expandable Storage
microSD, up to 512 GB (dedicated slot)	microSDXC	microSDXC (uses shared SIM slot)
USB OTG
Supported	Supported	Supported

Fingerprint

Proximity Sensor

Accelerometer Sensor

Magnetic-field Sensor (Compass)

Gyroscope Sensor

NFC

Type
Non-removable Li-Po Battery	Non-removable Li-Po Battery Battery Charging 10W	Non-removable Li-Po Battery Fast battery charging 15W
Capacity
3100 mAh	5000 mAh	4500 mAh
Stand by
-	-	-
Talk Time
-	-	-