Samsung Galaxy S21 Ultra 5G vs UMIDIGI A3S

Samsung Galaxy S21 Ultra 5G

UMIDIGI A3S

Network
2G network

GSM 850, 900, 1800, 1900; CDMA 800, 1900 & TD-SCDMA

GSM 850, 900, 1800, 1900
3G network

HSDPA 850, 900, 1700(AWS), 1900, 2100; CDMA2000 1xEV-DO

W-CDMA 850, 900, 1700, 1900, 2100
4G network

LTE frequency 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

LTE frequency band 1(2100), 2(1900), 3(1800), 4(1700), 5(850), 7(2600), 8(900), 12(700), 13(700), 17(700), 18(850), 19(850), 20(800), 26(850), 28(700), 38(2600), 40(2300), 41(2500)
5G network

5G band SA/NSA/Sub6/mmWave

-
HSDPA speed

42.2 Mbps

-
HSUPA speed

5.76 Mbps

-
LTE speed

LTE-A (CA), 2000 Mbps download, 200 Mbps upload

LTE Cat 4, 150 Mbps download, 51 Mbps upload
GPRS

Yes

Yes
EDGE

Yes

Yes

Design
Build

Glass front (Gorilla Glass Victus), glass back (Gorilla Glass), aluminum frame

Metal, glass
SIM

Single SIM (Nano-SIM and/or eSIM) or Dual SIM (Nano-SIM and/or eSIM, dual stand-by)

Dual SIM (Nano-SIM, dual SIM stand-by)
Height

165.1 mm

153.7 mm
Width

75.6 mm

72.9 mm
Thickness

8.9 mm

8.45 mm
Weight

227 (Sub6) / 229 (mmWave) g

197 g
Payment

Samsung Pay (Visa, MasterCard certified)

-
Waterproof

IP68 (1.5m and 30 mins)

-
Dust proof

IP68

-
Colors

Black, Brown, Silver, Navy, Titanium

Green, Grey

Display
Display type

Dynamic AMOLED 2X

IPS capacitive touchscreen
Physical size

6.8 inches

5.7 inches
Resolution

1440 x 3200 pixels

720 x 1440 pixels
Pixel density

515 ppi

282 ppi
Display colors

16777216

16777216
Protection

Scratch resistant, Corning Gorilla Glass Victus

2.5D curved glass screen, Scratch resistant
Multitouch

-

Yes
Display features

120Hz, HDR10+, 1500 nits (peak), Infinity-O display, Always-On display

-
DxOMark display score

91

-

Main camera
Camera type

Quad

Dual
Main camera

(wide) , 108 MP, f/1.8 , 26 mm, 1/1.33" , 0.8 µm

16 MP, f/2.0 , 0.26" , 1.132 µm
(periscope telephoto) , 10 MP, f/4.9 , 1/3.24" , 1.22 µm, 10x optical zoom

5 MP
(telephoto) , 10 MP, f/2.4 , 70 mm, 1/3.24" , 1.22 µm, 3x optical zoom
(ultrawide) , 12 MP, f/2.2 , 13 mm, 1/2.55" , 1.4 µm
Primary camera resolution

12000 x 9000 pixels

4608 x 3456 pixels
Primary camera video

8K@24fps, 4K@30/60fps, 1080p@30/60/240fps, 720p@960fps, HDR10+, stereo sound rec., gyro-EIS

1080p@30fps
Primary camera flash

LED flash

dual LED flash
Camera features

Autofocus, continuous shooting, digital zoom, optical zoom, optical image stabilization, geotagging, panorama, HDR, touch focus, face detection, white balance settings, ISO settings, exposure compensation, self-timer, scene-mode, phase detection autofocus, laser autofocus

Autofocus, continuous shooting, digital zoom, digital image stabilization, geotagging, panorama, HDR, touch focus, face detection, white balance settings, ISO settings, exposure compensation, self-timer, scene-mode, phase detection autofocus
DxOMark photo

128

-
DxOMark zoom

76

-
DxOMark video

98

-
DxOMark camera score

121

-

Selfie camera
Selfie camera

(wide) , 40 MP, f/2.2 , 80˚ , 26 mm, 1/2.8" , 0.7 µm

13 MP, f/2.0
Selfie camera resolution

7968 x 5480 pixels

4160 x 3120 pixels
Selfie camera features

Autofocus, HDR, phase detection autofocus

-
Selfie camera video

4K@30/60fps, 1080p@30fps

1080p@30fps
DxOMark photo

105

-
DxOMark video

93

-
DxOMark camera score

100

-

Connectivity
WLAN

Wi-Fi 802.11a, 802.11b, 802.11g, 802.11n, 802.11n 5GHz, 802.11ac, 802.11ax, 6E

Wi-Fi 802.11a, 802.11b, 802.11g, 802.11n, 802.11n 5Ghz, 802.11ac
WLAN WiFi Hotspot

Yes

Yes
WLAN WiFi Direct

Yes

Yes
Wi-Fi display

-

Yes
WLAN WiFi Dual Band

Yes

Yes
USB

Type-C 3.2

microUSB 2.0
USB On-The-Go

Yes

Yes
Bluetooth

v5.2

v5.0
Bluetooth A2DP

Yes

Yes
bluetooth HID

-

Yes
bluetooth LE

Yes

Yes
NFC

Yes

-
GPS

Yes, with A-GPS

Yes, with A-GPS
GLONASS

Yes

Yes
GALILEO

Yes

Yes
Beidou

-

Yes
BDS

Yes

-

Features
Sensors

Accelerometer, barometer, compass, fingerprint, gyroscope, proximity

Accelerometer, compass, fingerprint, gyroscope, proximity, light