UMIDIGI S2 vs Xiaomi Redmi 4 (4X)

UMIDIGI S2

Xiaomi Redmi 4 (4X)

Network
2G network

GSM 850, 900, 1800, 1900

GSM 850, 900, 1800, 1900; GSM 900, 1800 - India
3G network

HSDPA 850, 900, 1900, 2100

HSDPA 850, 900, 1900, 2100; CDMA2000 1xEV-DO & TD-SCDMA - China; HSDPA 900, 2100 - India
4G network

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

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

-

42.2 Mbps
HSUPA speed

-

5.76 Mbps
LTE speed

LTE, Cat6, 301 Mbps download, 51 Mbps upload

-
LTE-A speed

-

LTE-A, (2CA) Cat6, 300 Mbps download, 100 Mbps upload
GPRS

Yes

Yes
EDGE

Yes

Yes

Design
Build

Aluminium alloy

-
SIM

Dual SIM (Nano-SIM/Nano-SIM(microSD))

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

158.1 mm

139.2 mm
Width

74.6 mm

70 mm
Thickness

8.8 mm

8.7 mm
Weight

186 g

150 g
Colors

Black, Red

Black, Gold

Display
Display type

IPS capacitive touchscreen

IPS LCD capacitive touchscreen
Physical size

6 inches

5.0 inches
Resolution

720 x 1440 pixels

720 x 1280 pixels
Pixel density

268 ppi

294 ppi
Display colors

16777216

16777216
Protection

Scratch resistant, 2.5D curved glass screen, Corning Gorilla Glass 4

Corning Gorilla Glass
Multitouch

Yes

Yes

OS
OS

Android OS, v6.0 Marshmallow, UMI OS(Android 7.0 Nougat)

Android 6.0.1 (Marshmallow)

Main camera
Camera type

Dual

-
Main camera

13 MP, f/2.0 , 4 mm, 1.133 µm

13 MP, f/2.0
5 MP
Primary camera resolution

4160 x 3120 pixels

-
Primary camera video

2160p@30fps

1080p@30fps
Primary camera Autofocus

-

phase detection autofocus
Primary camera flash

quad-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/smile detection, panorama, touch focus

Connectivity
WLAN

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

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

Yes

Yes
WLAN WiFi Direct

Yes

Yes
Wi-Fi display

Yes

-
WLAN WiFi Dual Band

Yes

-
USB

Type-C reversible connector

microUSB 2.0
USB On-The-Go

Yes

-
Bluetooth

v4.0

v4.2
Bluetooth A2DP

Yes

Yes
bluetooth LE

-

Yes
Infrared

-

Yes
GPS

Yes, with A-GPS

Yes, with A-GPS
GLONASS

Yes

Yes
BDS

-

Yes

Features
Messaging SMS

-

SMS(threaded view)
Messaging MMS

-

MMS
Messaging Email

-

Email
Messaging IM

-

IM
Messaging Push Mail

-

Push Mail
Java

-

No
Sensors

Accelerometer, compass, fingerprint, hall, light, proximity

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