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Karbonn KT21 Express vs Samsung Galaxy S II

Karbonn KT21 Express Remove phone

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Posted: 25 Apr 2012
Market Status: Released

Samsung Galaxy S II Remove phone

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PA Rating - 9
User Rating - 9.2

Posted: 13 Feb 2011
Market Status: Released

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Design
Device typeFeature phoneSmart phone 
OS Android (4.1.2, 4.0.4, 4.0, 2.3) 
Dimensions 4.93 x 2.60 x 0.33 inches (125.3 x 66.1 x 8.49 mm) 
Weight 4.09 oz (116 g)
the average is 4.8 oz (136 g)
 
Display
Physical size2.8 inches4.3 inches 
Resolution 480 x 800 pixels 
Pixel density

Pixel density - The pixel density of a display represents the number of pixels over an area of one inch. It’s measured in “pixels per inch”, or ppi. The higher the number, the more detailed and good-looking the display is.

 218 ppi 
Technology

Technology - There are two main screen technologies currently used in phones and tablets: LCD and AMOLED. The former usually features a light source and liquid crystals, while the latter is based on organic light-emitting diodes. Newer LCD variations like IPS-LCD and Super-LCD allow for very accurate color reproduction and very wide viewing angles, where no significant image quality loss is observed. Current AMOLED screens differ in such a way that they can exhibit much more saturated colors (sometimes too much) and incredibly high contrast levels, which is due to black color being completely black in AMOLED displays.

 Super AMOLED Plus 
Colors 16 777 216 
TouchscreenMulti-touchMulti-touch 
FeaturesProximity sensorLight sensor, Proximity sensor, Scratch-resistant glass 
Camera
Camera3.2 megapixels8 megapixels 
FlashYesLED 
Aperture size

Aperture size - The aperture of a camera is the opening through which light travels before it reaches the camera sensor. The smaller the number is, the bigger this opening is, allowing for more light to pass.

 F2.6 
Camera sensor size 1/3.2" 
FeaturesDigital zoomBack-illuminated sensor (BSI), Autofocus, Smile detection, Digital zoom, Geo tagging, Panorama 
CamcorderYes1920x1080 (1080p HD) (30 fps), 1280x720 (720p HD) 
Features Video light, Video calling 
Front-facing camera 2 megapixels 
Hardware
System chip

System chip - Most modern handsets use an advanced chip that includes many of the device’s hardware modules like the processor, Wi-Fi, Bluetooth and sometimes even the wireless radio. This field shows what particular system chip (or System-on-a-Chip) is used in the phone.

 Samsung Exynos 4210 
Processor

Processor - The processor is the main computing component of a phone and is a major factor when it comes to the overall speed of the device. Some more powerful smartphones use dual-core and quad-core processors designed to deliver greater performance.

 Dual core, 1200 MHz, ARM Cortex-A9 
Graphics processor ARM Mali-400 
System memory

System memory - System memory, or RAM memory is the type of memory that the device uses to temporarily store data from the OS or currently-running apps. The more RAM available to the device, the better the performance will be when multiple or heavier programs are running.

 1024 MB RAM 
Built-in storage 32 GB 
Storage expansionmicroSD, microSDHC up to 32 GBmicroSD, microSDHC up to 32 GB 
Battery
Talk time 18.30 hours
the average is 12 h (732 min)
 
Stand-by time 29.6 days (710 hours)
the average is 21 days (502 h)
 
Talk time (3G) 9.00 hours
the average is 13 h (769 min)
 
Stand-by time (3G) 25.8 days (620 hours)
the average is 21 days (502 h)
 
Capacity1000 mAh1650 mAh 
specifications continue after the ad
Multimedia
Music player   
Filter by Album, Artist, Playlists 
Features Album art cover, Background playback 
RadioFM, Recording optionFM, Stereo, RDS 
SpeakersLoudspeaker  
YouTube player Yes 
Internet browsing
Built-in online services supportFacebook, YouTube (upload)Facebook, Picasa/Google+, Twitter 
Technology
GSM900, 1800 MHz850, 900, 1800, 1900 MHz 
UMTS 850, 900, 1900, 2100 MHz 
DataEDGE, GPRSHSDPA+ (4G) 21.1 Mbit/s, HSPA (unspecified), HSUPA 5.76 Mbit/s, UMTS, EDGE 
Positioning

Positioning - This field shows the positioning systems supported by the device. There are three main types: GPS, A-GPS and GLONASS. GPS - This is one of the most widespread global positioning technologies, developed and maintained by the U.S. government. It uses satellites in order to detect your location. Works best in clear weather. A-GPS - A-GPS stands for Assisted GPS and is the industry standard for positioning and navigation. “Assisted” means that it can use local wireless networks, in addition to satellites, for quicker and more precise localization. GLONASS - GLONASS is a global positioning system, developed by the Russian Federation. It’s very similar to GPS, but isn’t so popular in cell phones.

 A-GPS 
Navigation Yes 
Connectivity
BluetoothYes3.0 
Wi-Fi 802.11 b, g, n 
Mobile hotspot Yes 
USB USB 2.0 
Connector microUSB 
Features Mass storage device, USB charging 
HDMI via microUSB 
Other DLNA, MHL, Computer sync, OTA sync, SyncML 
Other features
Notifications Haptic feedback, Music ringtones (MP3), Polyphonic ringtones, Vibration, Flight mode, Silent mode, Speakerphone 
Sensors Accelerometer, Gyroscope, Compass 
Other Voice dialing, Voice commands, Voice recording 
Availability
Officially announced 13 Feb 2011 
Shopping information
MSRP price $ 800 

To see the full specifications with in-depth details click here.

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