Phone Comparison - Lenovo K900 vs Karbonn A21 vs Karbonn A12

general General Info

Manufacturer Lenovo Karbonn Karbonn
Announced January 2013 2012 February 2013
Status Available - April 2013 Available Available - February 2013
Colors Black Pearl White Black/White
Form Factor Candybar Candybar Candybar
Dimension 157 x 78 x 6.9 mm
(6.18 x 3.07 x 0.27 in)
- 135 x 66 x 11 mm
(5.31 x 2.6 x 0.43 in)
Weight 162 g (5.71 oz) - 164 g (5.78 oz)
2G Network GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 GSM 900 / 1800 / 1900 - SIM 1 & SIM 2
3G Network HSDPA 2100 HSDPA 2100 HSDPA 2100 - SIM 1 only
Messaging SMS, MMS, EMail, IM SMS, MMS, Push Mail, EMail, IM SMS, MMS, Push Mail, EMail, IM

hardware Hardware and OS

OS Android OS, v4.2 (Jelly Bean) Android OS, v4.0 (Ice Cream Sandwich) Android OS, v4.0.4 (Ice Cream Sandwich)
Processor Dual-core 2.0 GHz, Intel Atom Z2580 Dual-core 1.2 GHz 1 GHz
GPU PowerVR SGX544 - -
RAM 2 GB 512 MB 512 MB
Internal Memory 16 GB 4 GB 4 GB
External Memory microSD, up to 32 GB microSD, up to 32 GB microSD, up to 32 GB

display Display

Type IPS LCD capacitive touchscreen TFT capacitive touchscreen Capacitive Touchscreen
Colors 16M colors 256K colors 262K colors
Size 5.5 inches 4.5 inches 4.5 inches
Resolution 1080 x 1920 pixels (401 ppi) 480 x 800 pixels (207 ppi) 480 x 854 pixels (218 ppi)
Screen-to-Body Ratio 67.94% - 62.46%
Multi-Touch yes yes yes

multimedia Multimedia

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

camera Camera

Rear Camera 13 MP, autofocus 5 MP, 2592х1944 pixels 5 MP, 2592х1944 pixels
Flash dual-LED flash LED flash LED flash
Features Geo-tagging, Touch Focus, Face Detection Auto focus, Geo-tagging, Face Detection Auto focus, Geo-tagging, Face Detection
Video Yes, 1080p@30fps Yes Yes
Front Camera Yes, 2 MP [Similar] Yes, 1.3 MP [Similar] Yes, VGA [Similar]

connectivity Connectivity and Data Rate

GPRS Yes Yes Yes
Edge Yes Yes Yes
3G HSPA+ HSDPA, 7.2 Mbps HSDPA, 7.2 Mbps; HSUPA, 5.76 Mbps
Bluetooth Yes, with A2DP Yes, v2.1 with A2DP Yes
Wi-Fi Wi-Fi 802.11 a/b/g/n, dual band, Wi-Fi hotspot Wi-Fi 802.11 b/g/n 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 Yes, with A-GPS support
Browser HTML5 HTML HTML

memory User Memory

Internal 16 GB, 2 GB RAM 4 GB, 512 MB RAM 4 GB, 512 MB RAM
Expandable Storage microSD, up to 32 GB 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 not supported

battery Battery

Type Li-Ion battery Li-Ion Battery Li-Ion Battery
Capacity 2500 mAh 1800 mAh 1800 mAh
Stand by - Up to 200 h Up to 180 h
Talk Time - Up to 5 h Up to 4 h