Nokia Lumia 830 vs Microsoft Lumia 640 XL LTE Dual SIM

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PHONES
Phone Names	Nokia Lumia 830	Microsoft Lumia 640 XL LTE Dual SIM

Network
2G bands	GSM 850 / 900 / 1800 / 1900	GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G bands	HSDPA 850 / 900 / 1900 / 2100	HSDPA 850 / 900 / 1700 / 1900 / 2100
4G bands	1, 3, 7, 8, 20	1, 2, 3, 4, 5, 7, 8, 12, 17, 20, 28, 38, 40
Speed	HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps	HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps
Technology	GSM / HSPA / LTE	GSM / HSPA / LTE
	2, 4, 5, 17 - AT&T	-

Launch
Announced	2014, September. Released 2014, September	2015, March. Released 2015, April
Status	Discontinued	Discontinued

Body
Dimensions	139.4 x 70.7 x 8.5 mm (5.49 x 2.78 x 0.33 in)	157.9 x 81.5 x 9 mm (6.22 x 3.21 x 0.35 in)
SIM	Nano-SIM	Dual SIM (Micro-SIM, dual stand-by)
Weight	150 g (5.29 oz)	171 g (6.03 oz)

Display
Protection	Corning Gorilla Glass 3	Corning Gorilla Glass 3
Resolution	720 x 1280 pixels, 16:9 ratio (~294 ppi density)	720 x 1280 pixels, 16:9 ratio (~259 ppi density)
Size	5.0 inches, 68.9 cm2 (~69.9% screen-to-body ratio)	5.7 inches, 88.9 cm2 (~69.1% screen-to-body ratio)
Type	IPS LCD	IPS LCD
	ClearBlack display	ClearBlack display

Platform
CPU	Quad-core 1.2 GHz Cortex-A7	Quad-core 1.2 GHz Cortex-A7
Chipset	Qualcomm Snapdragon 400 (28 nm)	Qualcomm MSM8226 Snapdragon 400 (28 nm)
GPU	Adreno 305	Adreno 305
OS	Microsoft Windows Phone 8.1, upgradable to Microsoft Windows 10	Microsoft Windows Phone 8.1, upgradable to Microsoft Windows 10

Memory
Card slot	microSDXC (dedicated slot)	microSDXC (dedicated slot)
Internal	16GB 1GB RAM	8GB 1GB RAM
	eMMC 4.5	eMMC 4.5

Main Camera
Features	Zeiss optics, LED flash, panorama	Zeiss optics, LED flash
Single	10 MP, f/2.2, 26mm (wide), 1/3.4", AF, OIS	13 MP, f/2.0, 28mm (wide), 1/3.0", AF
Video	1080p@30fps, stereo sound rec.	1080p@30fps

Selfie camera
Single	0.9 MP	5 MP
Video	720p	1080p@30fps

Sound
3.5mm jack	Yes	Yes
35mm jack	Yes	Yes
Loudspeaker	Yes	Yes

Comms
Bluetooth	4.0, A2DP, EDR, LE, aptX	4.0, A2DP
NFC	Yes	Yes
Positioning	GPS, GLONASS, BDS	GPS, GLONASS, BDS
Radio	FM radio	FM radio
USB	microUSB 2.0	microUSB 2.0
WLAN	Wi-Fi 802.11 a/b/g/n, dual-band, DLNA, hotspot	Wi-Fi 802.11 b/g/n, DLNA, hotspot

Features
Sensors	Accelerometer, gyro, proximity, compass	Accelerometer, proximity, compass, sensor core

Battery
Charging	Wireless (Qi)	-
Music play	Up to 78 h	-
Stand-by	Up to 528 h	Up to 936 h (2G) / Up to 936 h (3G)
Talk time	Up to 12 h 54 min (2G) / Up to 14 h 48 min (3G)	Up to 31 h 20 min (2G) / Up to 23 h 40 min (3G)
Type	Li-Ion 2200 mAh, removable (BV-L4A)	Li-Ion 3000 mAh, removable

Misc
Colors	Orange, green, white, black, gold	Matte cyan, Orange, Black, Matte white, Glossy white
Price	About 330 EUR	About 200 EUR
SAR	0.87 W/kg (head)     0.83 W/kg (body)	-
SAR EU	0.46 W/kg (head)     0.59 W/kg (body)	-

Tests
Audio quality	Noise -89.7dB / Crosstalk -91.6dB	Noise -93.0dB / Crosstalk -94.4dB
Battery life	Endurance rating 68h	Endurance rating 74h
Camera	Photo / Video	-
Display	Contrast ratio: 1078 (nominal), 1887 (sunlight)	Contrast ratio: 1119:1 (nominal), 3.065 (sunlight)
Loudspeaker	Voice 65dB / Noise 66dB / Ring 78dB	Voice 72dB / Noise 67dB / Ring 73dB

OUR TESTS
Audio quality	Noise -89.7dB / Crosstalk -91.6dB	Noise -93.0dB / Crosstalk -94.4dB
Battery (old)	Endurance rating 68h	Endurance rating 74h
Camera	Photo / Video	-
Display	Contrast ratio: 1078 (nominal), 1887 (sunlight)	Contrast ratio: 1119:1 (nominal), 3.065 (sunlight)
Loudspeaker	Voice 65dB / Noise 66dB / Ring 78dB	Voice 72dB / Noise 67dB / Ring 73dB