Samsung Galaxy M21s vs Samsung Galaxy Z Flip4

Samsung Galaxy M21s

Samsung Galaxy Z Flip4

Network
2G network

GSM 850, 900, 1800, 1900

GSM 850, 900, 1800, 1900; CDMA 800, 1900
3G network

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

HSDPA 850, 900, 1700(AWS), 1900, 2100; CDMA2000 1xEV-DO
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, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 28, 29, 34, 38, 39, 40, 41, 66
5G network

-

5G band 1, 3, 20, 41, 77, 78, 79, 81 SA/NSA/Sub6/mmWave
HSDPA speed

42.2 Mbps

42.2 Mbps
HSUPA speed

5.76 Mbps

5.76 Mbps
LTE speed

LTE-A, 603 Mbps download, 150 Mbps upload

LTE-A (6CA)
GPRS

Yes

Yes
EDGE

Yes

Yes

Design
Build

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

Plastic front (opened), glass back (Gorilla Glass Victus+), aluminum frame
SIM

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

Nano-SIM, eSIM
Height

159.2 mm

84.9 mm
Width

75.1 mm

71.9 mm
Thickness

8.9 mm

15.9-17.1 mm
Height unfolded

-

165.2 mm
Width unfolded

-

71.9 mm
Thickness unfolded

-

6.9 mm
Weight

191 g

187 g
Payment

-

Samsung Pay (Visa, MasterCard certified)
Waterproof

-

IPX8, 1.5m and 30 minutes
Colors

Black, Blue

Blue, Pink Gold, Graphite, Khaki, Navy, Purple, Red, Yellow

Display
Display type

Super AMOLED

Foldable Dynamic AMOLED 2X
Physical size

6.4 inches

6.7 inches
Resolution

1080 x 2340 pixels

1080 x 2640 pixels
Pixel density

403 ppi

426 ppi
Display colors

16777216

16777216
Protection

2.5D curved glass screen, Corning Gorilla Glass 3

-
Display features

420 nits (typ), Infinity U Display

120Hz, HDR10+, 1200 nits (peak)
Cover display

-

Super AMOLED
Cover display physical size

-

1.9 inches
Cover display resolution

-

260 x 512 pixels

Main camera
Camera type

Triple

Dual
Main camera

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

(wide) , 12 MP, f/1.8 , 24 mm, 1.8 µm, 83˚ , 10x digital zoom
(ultrawide) , 8 MP, f/2.2 , 1/4.0" , 1.12 µm

(ultrawide) , 12 MP, f/2.2 , 1.12 µm, 123˚
(depth) , 5 MP, f/2.2
Primary camera resolution

9280 x 6920 pixels

4032 x 3024 pixels
Primary camera video

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

4K@30/60fps, 1080p@60/240fps, 720p@960fps, HDR10+
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 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, tracking autofocus

Selfie camera
Selfie camera type

Single

Single
Selfie camera

(wide) , 32 MP, f/2.0 , 26 mm, 1/2.8" , 0.8 µm

(wide) , 10 MP, f/2.4 , 26 mm, 1.22 µm, 80˚
Selfie camera features

-

Autofocus, face unlock, HDR
Selfie camera video

1080p@30fps

4K@30fps

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, 802.11ac, 802.11ax
WLAN WiFi Hotspot

Yes

Yes
WLAN WiFi Direct

Yes

Yes
WLAN WiFi Dual Band

Yes

Yes
USB

Type-C 2.0

Type-C 2.0
USB On-The-Go

-

Yes
Bluetooth

v5.0

v5.2
Bluetooth A2DP

Yes

Yes
bluetooth LE

Yes

Yes
NFC

No

Yes
GPS

Yes, with A-GPS

Yes, with A-GPS
GLONASS

Yes

Yes
GALILEO

Yes

Yes
BDS

Yes

Yes