vivo S15 vs vivo V21

Network
2G network

GSM 850, 900, 1800, 1900; CDMA 800

GSM 850, 900, 1800, 1900
3G network

HSDPA 850, 900, 1700(AWS), 2100; CDMA2000 1x

HSDPA 850, 900, 1700(AWS), 1900, 2100
4G network

LTE frequency band 1, 2, 3, 4, 5, 7, 8, 19, 28, 34, 38, 39, 40, 41

LTE frequency band 1, 2, 3, 4, 5, 7, 8, 20, 28, 38, 39, 40, 41
5G network

5G band 1, 3, 5, 8, 28, 41, 77, 78 SA/NSA

-
HSDPA speed

42.2 Mbps

42.2 Mbps
HSUPA speed

5.76 Mbps

5.76 Mbps
EV-DO speed

-

EV-DO Rev.A 3.1 Mbps download, 1.8 Mbps upload
LTE speed

LTE-A

LTE-A, 1200 Mbps download, 150 Mbps upload
GPRS

Yes

Yes
EDGE

Yes

Yes

Design
Build

AG glass, plastic

Glass front, plastic frame, plastic back
SIM

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

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

161.1 mm

159.7 mm
Width

74.3 mm

73.9 mm
Thickness

8 mm

7.3 mm
Weight

197 g

176 g
Colors

Black, Blue, Yellow

Blue, Sunset Dazzle

Display
Display type

AMOLED

AMOLED
Physical size

6.62 inches

6.44 inches
Resolution

1080 x 2400 pixels

1080 x 2400 pixels
Pixel density

398 ppi

409 ppi
Display colors

16777216

16777216
Protection

Scratch resistant, 2.5D curved glass screen

Scratch resistant, 2.5D curved glass screen
Display features

120Hz, HDR10+, 1300 nits (peak)

-

Hardware
CPU

Octa-core

Octa-core
CPU

Single-core 3.2 GHz Kryo 585

Dual-core 2.4 GHz Cortex-A76
CPU(second)

Triple-core 2.42 GHz Kryo 585

Hexa-core 2.0 GHz Cortex-A55
CPU(third)

Quad-core 1.80 GHz Kryo 585
Chipset

Qualcomm SM8250-AC Snapdragon 870 5G

MediaTek MT6853 Dimensity 800U 5G
GPU

Adreno 650

Mali-G57 MC3
Internal storage

128, 256 GB

128 GB
Memory RAM

8, 12 GB

8 GB
Memory card

No

microSD, microSDHC, microSDXC
Memory card max

-

1 TB
Storage

UFS 3.1

UFS 2.2

Main camera
Camera type

Triple

Triple
Main camera

(wide) , 64 MP, f/1.9 , 25 mm, 1/1.72"

(wide) , 64 MP, f/1.8 , 26 mm, 1/1.72" , 0.8 µm
(ultrawide) , 8 MP, f/2.2 , 120˚ , 16 mm

(ultrawide) , 8 MP, f/2.2 , 120˚ , 16 mm, 1/4.0" , 1.12 µm
(macro) , 2 MP, f/2.4

(macro) , 2 MP, f/2.4
Primary camera resolution

9280 x 6920 pixels

9280 x 6920 pixels
Primary camera video

4K@30fps, 1080p@30fps

4K@30fps (no OIS), 1080p@30/60fps
Primary camera flash

LED flash

LED flash
Camera features

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

Selfie camera
Selfie camera type

Single

Single
Selfie camera

(wide) , 32 MP, f/2.0

(wide) , 44 MP, f/2.0
Selfie camera features

Face unlock, autofocus, HDR, face detection, panorama, geotagging, digital image stabilization

Autofocus, face unlock, HDR
Selfie camera video

1080p@30fps

4K@30fps (no OIS), 1080p@30fps

Connectivity
WLAN

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

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
WLAN WiFi Dual Band

Yes

Yes
USB

Type-C 2.0

Type-C 2.0
USB On-The-Go

Yes

Yes
Bluetooth

v5.2

v5.1
Bluetooth A2DP

Yes

Yes
bluetooth LE

Yes

Yes
Bluetooth AptX

aptX HD, aptX Adaptive

-
NFC

Yes

No
GPS

Yes, with A-GPS

Yes, with A-GPS
GLONASS

Yes

Yes
GALILEO

Yes

Yes
BDS

Yes

Yes
QZSS

Yes

-