BLU C4 vs vivo X20 Plus

Network
2G network

GSM 850, 900, 1800, 1900

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

HSDPA 850, 1900, 2100

HSDPA 850, 900, 1900, 2100
4G network

-

LTE frequency band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 12(700), 17(700), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)
HSDPA speed

21 Mbps

-
HSUPA speed

5.76 Mbps

-
HSPA speed

-

HSPA
LTE speed

-

LTE
GPRS

Yes

Yes
EDGE

Yes

Yes

Design
Build

Plastic

-
SIM

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

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

124.3 mm

165.3 mm
Width

64.2 mm

80.1 mm
Thickness

10.9 mm

7.5 mm
Weight

118 g

181.5 g
Colors

Black, Blue, Gold

Gold, Matte Black, Rose gold

Main camera
Camera type

-

Dual
Main camera

5 MP

12 MP, f/1.8
5 MP
Primary camera resolution

2592 x 1944 pixels

-
Primary camera video

720p@30fps

1080p@30fps
Primary camera Autofocus

-

autofocus
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

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

-

92
DxOMark video

-

87
DxOMark camera score

-

90

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
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

Features
Messaging SMS

-

SMS(threaded view)
Messaging MMS

-

MMS
Messaging Email

-

Email
Messaging Push Email

-

Push Email
Java

-

No
Sensors

Accelerometer, light, proximity

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