Phone Comparison - Nokia Lumia 900 vs Karbonn A21 vs Sony Xperia M

general General Info

Manufacturer Nokia Karbonn Sony
Announced January 2012 2012 June 2013
Status Available - May 2012 Available Available - August 2013
Colors Black, cyan Pearl White Black, White, Purple, Yellow
Form Factor Candybar Candybar Candybar
Dimension 127.8 x 68.5 x 11.5 mm, 90 cc
(5.03 x 2.7 x 0.45 in, 3.54 cc)
- 124 x 62 x 9.3 mm
(4.88 x 2.44 x 0.37 in)
Weight 160 g (5.64 oz) - 115 g (4.06 oz)
2G Network GSM 850 / 900 / 1800 / 1900 GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 GSM 850 / 900 / 1800 / 1900 - Both Versions
3G Network HSDPA 850 / 900 / 1900 / 2100 HSDPA 2100 HSDPA 900 / 2100 - C1905
HSDPA 850 / 1700 / 1900 / 2100 - C1904
4G Network LTE 700 / 1700 / 2100 - -
Messaging SMS, MMS, Push Mail, EMail, IM SMS, MMS, Push Mail, EMail, IM SMS, MMS, Push Mail, EMail, IM

hardware Hardware and OS

OS Microsoft Windows Phone 7.5 Mango Android OS, v4.0 (Ice Cream Sandwich) Android OS, v4.1 (Jelly Bean)
Processor 1.4 GHz Scorpion, Qualcomm APQ8055 Snapdragon Dual-core 1.2 GHz Dual-core 1 GHz Krait, Qualcomm MSM8227
GPU Adreno 205 - Adreno 305
RAM 512 MB 512 MB 1 GB
Internal Memory 16 GB storage 4 GB 4 GB
External Memory No microSD, up to 32 GB microSD, up to 32 GB

display Display

Type AMOLED capacitive touchscreen TFT capacitive touchscreen TFT capacitive touchscreen
Colors 16M colors 256K colors 16M colors
Size 4.3 inches 4.5 inches 4.0 inches
Resolution 480 x 800 pixels (217 ppi) 480 x 800 pixels (207 ppi) 480 x 854 pixels (245 ppi)
Screen-to-Body Ratio 60.10% - 57.31%
Multi-Touch yes yes yes

multimedia Multimedia

3.5mm Jack yes yes yes
Radio Stereo FM radio with RDS No Stereo FM radio with RDS
Games Yes Yes + Downloadable Yes + Downloadable
Loud Speaker yes yes yes

camera Camera

Rear Camera 8 MP, 3264x2448 pixels 5 MP, 2592х1944 pixels 5 MP, 2592х1944 pixels
Flash Carl Zeiss optics LED flash LED flash
Features Geo-tagging Auto focus, Geo-tagging, Face Detection Auto focus, Geo-tagging, Touch Focus, Image Stabilization, HDR, Panorama
Video Yes, 720p@30fps, video stabilization Yes Yes, 720p@30fps
Front Camera Yes, 1.3 MP, VGA@30fps [Similar] Yes, 1.3 MP [Similar] Yes, VGA [Similar]

connectivity Connectivity and Data Rate

GPRS Class 33 Yes Up to 86 kbps
Edge Class 33 Yes Up to 237 kbps
3G HSDPA, 21 Mbps; HSUPA, 5.76 Mbps, LTE, Cat3, 50 Mbps DL, 25 Mbps UL HSDPA, 7.2 Mbps HSDPA, 21 Mbps; HSUPA, 5.76 Mbps
Bluetooth Yes, v2.1 with A2DP, EDR Yes, v2.1 with A2DP Yes, v4.0 with A2DP, ANT+
Wi-Fi Wi-Fi 802.11 b/g/n Wi-Fi 802.11 b/g/n Wi-Fi 802.11 a/b/g/n, dual-band, Wi-Fi Direct, DLNA, Wi-Fi hotspot
USB Yes, microUSB v2.0, HS Yes, microUSB v2.0 Yes, microUSB v2.0
GPS Yes, with A-GPS support Yes, with A-GPS support Yes, with A-GPS support
Browser HTML5 HTML HTML5

memory User Memory

Internal 16GB storage, 512 MB RAM 4 GB, 512 MB RAM 4 GB, 1 GB RAM
Expandable Storage No microSD, up to 32 GB microSD, up to 32 GB

Apps Sensors

Fingerprint fingerprint not supported fingerprint not supported fingerprint not supported
Proximity Sensor proximity sensor present proximity sensor present proximity sensor present
Accelerometer Sensor accelerometer sensor present accelerometer sensor present accelerometer sensor present
NFC NFC not supported NFC not supported NFC supported

battery Battery

Type Standard battery, Li-Ion Li-Ion Battery Li-Ion Battery
Capacity 1830 mAh (BP-6EW) 1800 mAh 1700 mAh
Stand by Up to 300 h Up to 200 h Up to 498 h (2G)
Up to 454 h (3G)
Talk Time Up to 7 h Up to 5 h Up to 10 h 16 min (2G)
Up to 9 h (3G)