ZTE Nubia Z7 mini vs Samsung Galaxy S5 mini Duos vs Microsoft Lumia 640 Dual SIM

General Info

Manufacturer
ZTE	Samsung	Microsoft
Announced
July 2014	August 2014	March 2015
Status
Available - July 2014	Available - August 2014	Available - April 2015
Price
-	-	Rs. 8,999 ($132.34) [Similarly Priced]
Colors
Black, White, Red, Green, Yellow	Charcoal Black, Shimmery White	Yes
Form Factor
Candybar	Candybar	Candybar
Dimension
140.9 x 69.3 x 8.2 mm (5.55 x 2.73 x 0.32 in)	-	141.3 x 72.2 x 8.8 mm (5.56 x 2.84 x 0.35 in)
Weight
143 g (5.04 oz)	-	145 g (5.11 oz)
2G Network
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2	GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2	GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G Network
HSDPA 850 / 900 / 1900 / 2100	HSDPA	HSDPA 850 / 900 / 1900 / 2100
4G Network
LTE 1800 / 2100 / 2600	-	-
Messaging
SMS, MMS, Push Mail, EMail, IM	SMS, MMS, EMail, IM	SMS, MMS, Push Mail, EMail, IM
Build Features
-	- Fingerprint sensor - IP67 certified - dust and water resistant - Water resistant up to 1 meter and 30 minutes	-

OS
Android OS, v4.4.2 (KitKat)	Android OS, v4.4.4 (KitKat)	Microsoft Windows Phone 8.1 with Lumia Denim
Processor
Quad-core 2.0 GHz Krait 400, Qualcomm MSM8974AA Snapdragon 801	Quad-core 1.4 GHz,	Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400
GPU
Adreno 330	-	Adreno 305
RAM
2 GB	1.5 GB	1 GB
Internal Memory
16 GB	16 GB	8 GB
External Memory
microSD, up to 64 GB	microSD, up to 64 GB	microSD, up to 128 GB

Type
Capacitive touchscreen	Super AMOLED capacitive touchscreen	IPS LCD Capacitive Touchscreen, Corning Gorilla Glass 3, ClearBlack Display
Colors
16M colors	16M colors	16M colors
Size
5.0 inches	4.5 inches	5.0 inches
Resolution
1080 x 1920 pixels (445 ppi)	720 x 1280 pixels (326 ppi)	720 x 1280 pixels (294 ppi)
Screen-to-Body Ratio
69.19%	-	67.43%
Multi-Touch

Rear Camera
13 MP, 4128 x 3096 pixels	8 MP, 3264 x 2448 pixels	8 MP, 3264 x 2448 pixels
Flash
LED flash	LED flash	LED flash
Features
Auto focus, Geo-tagging, Touch Focus, Face Detection, Panorama, HDR	Auto focus, Geo-tagging, Touch Focus, Face Detection, HDR, Panorama	Auto focus, 1/4'' Sensor Size
Video
1080p@30fps	1080p@30fps	1080p@30fps
Front Camera
5 MP, 1080p@30fps	2.1 MP, 1080p@30fps	1 MP, 720p

GPRS
Yes	Yes	Yes
Edge
Yes	Yes	Yes
3G
HSDPA, HSUPA, LTE	HSDPA, 21 Mbps; HSUPA, 5.76 Mbps	HSPA 42.2/5.76 Mbps
Bluetooth
v4.0, A2DP	v4.0, A2DP, EDR, LE	v4.0, A2DP
Wi-Fi
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA, Wi-Fi hotspot	Wi-Fi 802.11 a/b/g/n, dual-band, Wi-Fi Direct, Wi-Fi hotspot	Wi-Fi 802.11 b/g/n, DLNA, hotspot
USB
microUSB v2.0	microUSB v2.0	microUSB v2.0
GPS
Yes, with A-GPS, GLONASS	Yes, with A-GPS, GLONASS	Yes, with A-GPS, GLONASS, Beidou
Browser
HTML5	HTML5	HTML5