Nokia Lumia 820 vs Nokia Lumia 925 vs Nokia Lumia 635

General Info

Manufacturer
Nokia	Nokia	Nokia
Announced
Expected September 2012	May 2013	April 2014
Status
Available - November 2012	Available - June 2013	Available - May 2014
Colors
Black, Gray, Red, Yellow, White, Blue, Violet	Black, White	Orange, Yellow, White, Black
Form Factor
Candybar	Candybar	Candybar
Dimension
123.8 x 68.5 x 9.9 mm (4.87 x 2.7 x 0.39 in)	129 x 70.6 x 8.5 mm (5.08 x 2.78 x 0.33 in)	129.5 x 66.7 x 9.2 mm (5.1 x 2.63 x 0.36 in)
Weight
160 g (5.64 oz)	139 g (4.9 oz)	134 g (4.73 oz)
2G Network
GSM 850 / 900 / 1800 / 1900	GSM 850 / 900 / 1800 / 1900	GSM 850 / 900 / 1800 / 1900
3G Network
HSDPA 850 / 900 / 1900 / 2100	HSDPA 850 / 900 / 1900 / 2100 - RM-892, RM-893 HSDPA 850 / 900 / 1700 / 1900 / 2100 - RM-910	HSDPA 850 / 900 / 1900 / 2100
4G Network
LTE 800 / 1800 / 2600 / 2100/ 900	LTE 800 / 900 / 1800 / 2100 / 2600 - RM-892 LTE 700 / 1700 / 2100 - RM-893	LTE
Messaging
SMS, MMS, Push Mail, EMail, IM	SMS, MMS, Push Mail, EMail, IM	SMS, MMS, Push Mail, EMail, IM

OS
Microsoft Windows Phone 8	Microsoft Windows Phone 8	Microsoft Windows Phone 8.1
Processor
Dual-core 1.5 GHz Krait, Qualcomm MSM8960 Snapdragon	Dual-core 1.5 GHz Krait, Qualcomm MSM8960 Snapdragon	Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400
GPU
Adreno 225	Adreno 225	Adreno 305
RAM
1 GB	1 GB	512 MB
Internal Memory
8 GB storage	16/32 GB storage	8 GB
External Memory
microSD, up to 32 GB	No	microSD, up to 64 GB

Type
AMOLED capacitive touchscreen	AMOLED capacitive touchscreen	IPS LCD capacitive touchscreen
Colors
16M colors	16M colors	16M colors
Size
4.3 inches	4.5 inches	4.5 inches
Resolution
480 x 800 pixels (217 ppi)	768 x 1280 pixels (332 ppi)	480 x 854 pixels (218 ppi)
Screen-to-Body Ratio
62.04%	63.18%	64.43%
Multi-Touch

Rear Camera
8 MP, 3264x2448 pixels, Carl Zeiss Tessa	8.7 MP, 3264 x 2448 pixels	5 MP, 2592 х 1944 pixels
Flash
LED flash	Dual-LED flash	No
Features
Auto focus, Geo-tagging	PureView Technology, Geo-tagging, Touch Focus, Optical image stabilization, Still image editor, Face recognition	Geo-tagging
Video
Yes	Yes, 1080p@30fps, video stabilization	Yes, 720p@30fps
Front Camera
Yes	Yes, 1.2 MP wide Angle, 720p@30fps	No

GPRS
Yes	Class 12 (4+1/3+2/2+3/1+4 slots), 32 - 48 kbps	Yes
Edge
Yes	Up to 236.8 kbps	Yes
3G
HSDPA, 42 Mbps HSUPA, 5.76 Mbps LTE, Cat3, 50 Mbps UL, 100 Mbps DL	HSDPA, 42.2 Mbps; HSUPA, 5.76 Mbps; LTE, Cat3, 50 Mbps UL, 100 Mbps DL	HSDPA, 21 Mbps; HSUPA, 5.76 Mbps; LTE, Cat3, 50 Mbps UL, 100 Mbps DL
Bluetooth
Yes, v3.1 with A2DP, EDR	Yes, v4.0 with A2DP, EDR	Yes, v4.0 with A2DP
Wi-Fi
Wi-Fi 802.11 b/g/n	Wi-Fi 802.11 a/b/g/n, dual-band, DLNA, Wi-Fi hotspot	Wi-Fi 802.11 b/g/n
USB
Yes, microUSB v2.0	Yes, microUSB v2.0	Yes, microUSB v2.0
GPS
Yes, with A-GPS support	Yes, with A-GPS support and GLONASS	Yes, with A-GPS support and GLONASS
Browser
HTML5	HTML5	HTML5

Type
Standard battery, Li-Ion	Non-removable Li-Ion Battery (BL-4YW)	Li-Ion Battery
Capacity
1650 mAh	2000 mAh	1830 mAh
Stand by
Up to 330 h (2G) Up to 330 h (3G)	Up to 440 h (3G)	Up to 648 h
Talk Time
Up to 14 h (2G) Up to 8 h (3G)	Up to 18 h 18 min (2G) Up to 12 h 48 min (3G)	Up to 12 h (2G) Up to 14 h (3G)