Samsung Galaxy M21s vs vivo Y81

Samsung Galaxy M21s

vivo Y81

Network
2G network

GSM 850, 900, 1800, 1900

GSM 850, 900, 1800, 1900; CDMA 800 & TD-SCDMA
3G network

HSDPA 850, 900, 1700(AWS), 1900, 2100

HSDPA 850, 900, 2100
4G network

LTE frequency band 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 20, 26, 28, 38, 40, 41, 66

LTE frequency band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)
HSDPA speed

42.2 Mbps

-
HSUPA speed

5.76 Mbps

-
LTE speed

LTE-A, 603 Mbps download, 150 Mbps upload

LTE, Cat7, 301 Mbps download, 102 Mbps upload
GPRS

Yes

Yes
EDGE

Yes

Yes

Design
Build

Glass front (Gorilla Glass 3), plastic back, plastic frame

Aluminium alloy, plastic
SIM

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

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

159.2 mm

155 mm
Width

75.1 mm

75 mm
Thickness

8.9 mm

7.77 mm
Weight

191 g

146 g
Colors

Black, Blue

Black

Display
Display type

Super AMOLED

IPS capacitive touchscreen
Physical size

6.4 inches

6.22 inches
Resolution

1080 x 2340 pixels

720 x 1520 pixels
Pixel density

403 ppi

270 ppi
Display colors

16777216

16777216
Protection

2.5D curved glass screen, Corning Gorilla Glass 3

Corning Gorilla Glass
Multitouch

-

Yes
Display features

420 nits (typ), Infinity U Display

-

Main camera
Camera type

Triple

-
Main camera

(wide) , 64 MP, f/1.8 , 26 mm, 1/1.72" , 0.8 µm

13 MP, f/2.2
(ultrawide) , 8 MP, f/2.2 , 1/4.0" , 1.12 µm
(depth) , 5 MP, f/2.2
Primary camera resolution

9280 x 6920 pixels

4160 x 3120 pixels
Primary camera video

4K@30fps, 1080p@30fps, gyro-EIS

1080p@30fps
Primary camera flash

LED flash

LED flash
Camera features

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

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

Connectivity
WLAN

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

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

Yes

Yes
WLAN WiFi Direct

Yes

Yes
WLAN WiFi Dual Band

Yes

Yes
USB

Type-C 2.0

microUSB 2.0
USB On-The-Go

-

Yes
Bluetooth

v5.0

v4.2
Bluetooth A2DP

Yes

Yes
bluetooth LE

Yes

-
NFC

No

-
GPS

Yes, with A-GPS

Yes, with A-GPS
GLONASS

Yes

Yes
GALILEO

Yes

-
BDS

Yes

-