| Name | Karbonn A21
 | Oppo A15s
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| Processor: | 1.2 GHz Qualcomm Scorpion Dual Core | 2.3GHz Mediatek Helio P35 octa core |
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| Chipset: | | P35 |
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| GPU: | No GPU | IMG GE8320 |
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| Operating System: | Android | Android |
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| Operating System Version: | Ice Cream Sandwich (4.0) | Android 10 |
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| Sensors: | Light Sensor, 3D G-Sensor and Proximity Sensor | Fingerprint sensor |
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| Manufacturer: | Karbonn | Oppo |
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| Series Name: | Karbonn A | A |
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| Dimensions: | N/A | 7.5 x 0.8 x 16.4 Centimeters |
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| Weight: | 130g | 120 gram |
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| Camera Type: | Dual Camera | Dual Camera |
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| Front Camera: | 1.3 Mega Pixels | 8MP AI Beautification |
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| Back Camera: | 5 Mega Pixels | 13MP+2MP+2MP |
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| Camera features: | 2592 x 1944 pixels resolution, HD images, LED Flash, Auto Focus, Face Detection, Digital Zooming etc. | Depth and Macro with AI beautification |
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| Video Camera features: | Camera can capture videos in MP4, H.263, H.264, AVI and 3GP formats. | |
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| RAM: | 1GB | 4GB |
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| External Memory: | Up to 32 GB | Expandable to 256GB |
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| Internal Storage: | 4 GB Storage | 64GB |
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| Screen Size: | 480 x 800 px | 16.55 centimeters (6.52-inch) |
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| Display: | 4.5 inches TFT Capacitive Touchscreen | 1520 x 720 pixel |
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| Ports: | USB 2.0 | USB |
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| Battery Type: | 1800 mAh | 4230 mAH lithium-polymer battery |
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| Battery (Talk Time): | 5 hours (2G) and 8 hours (3G) | 29 hours |
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| Battery (Standby Time): | 200 hours (2G) and 290 hours (3G) | 323 hours |
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| Video: | MP4, AVI, 3GP, H.263 and H.264 | |
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| Audio: | MIDI, WAV and MP3 | Dirac 2.0 |
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| Accessories: | | USB Cable, Adapter, Sim Tray Ejector, Protective Case, Booklet with Warranty Card, and Quick Guide. |
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| Bluetooth: | v2.1 | Yes |
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| GPRS: | Yes | Yes |
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| Connectivity: | 3G - HSDPA, 7.2 Mbps, Wi-Fi - 802.11 b/g/n, EDGE and A-GPS with Google Maps | 4G |
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| Network: | 2G - GSM 850 / 900 / 1800 / 1900, 3G - HSDPA 850 / 1900 / 2100 | 4G LTE, 2G, 3G |
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| Announced/Launched Date: | September 2012 | December 2020 |
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| Available Colors: | Pearl White | White/Black/Silver |
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| Built-in Apps: | Gmail, Twitter, Google Search, Google Play, Skype, Google Talk, Yahoo Messenger, Flickr, Picasa, Facebook, PayTM, NexGTv, WhatsApp, Mobile TV and Google Currents | |
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| SIM Card Type: | Regular SIM | Nano SIM |
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| SIM Slots: | Dual SIM | Dual SIM |
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| Category: | Mid range Smartphone | Mid range Smartphone |
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| Price Range: | US$100 to US$199 | US$100 to US$199 |
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| Sensors: Accelerometer: | | Yes |
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| Sensors: Gyroscope: | | Yes |
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| Sensors: GPS: | | Yes |
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| Sensors: Compass: | | Yes |
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| Sensors: Barometer: | | Yes |
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| Read Karbonn A21 reviews. | Read Oppo A15s reviews. |
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| Compare Karbonn A21:
HTC 8XSamsung Galaxy S DUOSSamsung Galaxy Note IINokia Lumia 920Samsung Galaxy Victory Lenovo S880LG Optimus L5 E612LG Optimus L7 P705SONY Xperia USony Xperia PSony Ericsson Xperia ARC S LT18iNokia Lumia 810LG Optimus L9 P765LG E730Apple's iPhone 4SLava XOLO A700Karbonn A11Micromax A116 Canvas HDIntex Aqua StyleSamsung Galaxy S II plusSamsung Galaxy Grand Duos GT-i9082EWASony Xperia tipo dualSamsung Galaxy Fame S6810BLU Quattro 4.5 HDLava XOLO A1000 | Compare Oppo A15s:
HTC 8XSamsung Galaxy S DUOSSamsung Galaxy Note IINokia Lumia 920Samsung Galaxy Victory Lenovo S880LG Optimus L5 E612LG Optimus L7 P705SONY Xperia USony Xperia PSony Ericsson Xperia ARC S LT18iNokia Lumia 810LG Optimus L9 P765LG E730Apple's iPhone 4SLava XOLO A700Karbonn A11Karbonn A21Micromax A116 Canvas HDIntex Aqua StyleSamsung Galaxy S II plusSamsung Galaxy Grand Duos GT-i9082EWASony Xperia tipo dualSamsung Galaxy Fame S6810BLU Quattro 4.5 HD |