Microsoft Lumia 640 LTE vs Nokia Lumia 830

Phones Images

PHONES
Phone Names	Microsoft Lumia 640 LTE	Nokia Lumia 830

Network
2G bands	GSM 850 / 900 / 1800 / 1900	GSM 850 / 900 / 1800 / 1900
3G bands	HSDPA 850 / 900 / 2100	HSDPA 850 / 900 / 1900 / 2100
4G bands	1, 3, 7, 8, 20	1, 3, 7, 8, 20
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
	1, 2, 4, 5, 7, 12, 17 - T-Mobile	2, 4, 5, 17 - AT&T

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

Body
Dimensions	141.3 x 72.2 x 8.8 mm (5.56 x 2.84 x 0.35 in)	139.4 x 70.7 x 8.5 mm (5.49 x 2.78 x 0.33 in)
SIM	Micro-SIM	Nano-SIM
Weight	145 g (5.11 oz)	150 g (5.29 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 (~294 ppi density)
Size	5.0 inches, 68.9 cm2 (~67.6% screen-to-body ratio)	5.0 inches, 68.9 cm2 (~69.9% 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 MSM8926 Snapdragon 400 (28 nm)	Qualcomm 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	8GB 1GB RAM	16GB 1GB RAM
	eMMC 4.5	eMMC 4.5

Main Camera
Features	LED flash	Zeiss optics, LED flash, panorama
Single	8 MP, f/2.2, 28mm (wide), 1/4.0", AF	10 MP, f/2.2, 26mm (wide), 1/3.4", AF, OIS
Video	1080p@30fps	1080p@30fps, stereo sound rec.

Selfie camera
Single	1 MP	0.9 MP
Video	720p	720p

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

Comms
Bluetooth	4.0, A2DP	4.0, A2DP, EDR, LE, aptX
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 b/g/n, DLNA, hotspot	Wi-Fi 802.11 a/b/g/n, dual-band, DLNA, hotspot

Features
Sensors	Accelerometer, proximity, compass	Accelerometer, gyro, proximity, compass

Battery
Charging	-	Wireless (Qi)
Music play	-	Up to 78 h
Stand-by	Up to 864 h (2G) / Up to 864 h (3G)	Up to 528 h
Talk time	Up to 26 h 30 min (2G) / Up to 17 h 30 min (3G)	Up to 12 h 54 min (2G) / Up to 14 h 48 min (3G)
Type	Li-Ion 2500 mAh, removable	Li-Ion 2200 mAh, removable (BV-L4A)

Misc
Colors	Glossy cyan, Orange, White, Matte black	Orange, green, white, black, gold
Price	About 120 EUR	About 330 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 -93.1dB / Crosstalk -93.2dB	Noise -89.7dB / Crosstalk -91.6dB
Battery life	Endurance rating 76h	Endurance rating 68h
Camera	Photo / Video	Photo / Video
Display	Contrast ratio: 1034 (nominal), 2.563 (sunlight)	Contrast ratio: 1078 (nominal), 1887 (sunlight)
Loudspeaker	Voice 70dB / Noise 65dB / Ring 75dB	Voice 65dB / Noise 66dB / Ring 78dB

OUR TESTS
Audio quality	Noise -93.1dB / Crosstalk -93.2dB	Noise -89.7dB / Crosstalk -91.6dB
Battery (old)	Endurance rating 76h	Endurance rating 68h
Camera	Photo / Video	Photo / Video
Display	Contrast ratio: 1034 (nominal), 2.563 (sunlight)	Contrast ratio: 1078 (nominal), 1887 (sunlight)
Loudspeaker	Voice 70dB / Noise 65dB / Ring 75dB	Voice 65dB / Noise 66dB / Ring 78dB