Cubot X18 vs vivo X21

Network
2G network

GSM 850, 900, 1800, 1900

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

HSDPA 900, 2100

HSDPA 850, 900, 1900, 2100
4G network

LTE frequency band 1(2100), 3(1800), 7(2600), 8(900), 18(800)

LTE frequency band 1(2100), 2(1900), 3(1800), 5(850), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)
HSPA speed

-

HSPA
LTE speed

LTE, Cat4, 150 Mbps download, 51 Mbps upload

LTE
GPRS

Yes

Yes
EDGE

Yes

Yes

Design
Build

Plastic, aluminimum alloy

Front glass, aluminum body
SIM

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

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

159.6 mm

154.5 mm
Width

74 mm

74.8 mm
Thickness

8.5 mm

7.4 mm
Weight

175 g

156.2 g
Colors

Blue, Gold

Aurora White, Black, Ruby Red

Main camera
Camera type

-

Dual
Main camera

13 MP, f/2.2 , 1.115 µm

12 MP, f/1.8 , 1.4 µm, 1/2.5"
5 MP, f/2.4
Primary camera resolution

4208 x 3120 pixels

4032 x 3024 pixels
Primary camera video

1080p@30fps

1080p@30fps
Primary camera Autofocus

-

dual pixel phase detection autofocus
Primary camera flash

dual-LED flash

LED flash
Camera features

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

Geo-tagging, HDR, face detection, panorama, touch focus

Connectivity
WLAN

Wi-Fi 802.11b, 802.11g, 802.11n

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

Yes

Yes
WLAN WiFi Direct

Yes

Yes
WLAN WiFi Dual Band

-

Yes
USB

microUSB 2.0

microUSB 2.0
USB On-The-Go

-

Yes
Bluetooth

v4.0

v5.0
Bluetooth A2DP

Yes

Yes
bluetooth LE

-

Yes
GPS

Yes, with A-GPS

Yes, with A-GPS
GLONASS

Yes

Yes

Features
Messaging SMS

-

SMS(threaded view)
Messaging MMS

-

MMS
Messaging Email

-

Email
Messaging Push Email

-

Push Email
Sensors

Accelerometer, fingerprint, light, proximity

Fingerprint (rear-mounted), accelerometer, compass, proximity