Karbonn K21+ mobile was launched in September 2012. The phone comes with a 2.20-inch display offering a resolution of 128x160 pixels. Karbonn K21+ is powered by an one-core processor. The Karbonn K21+ is powered by a 1000mAh removable battery.
As far as the cameras are concerned, the Karbonn K21+ on the rear packs 0.3-megapixel camera.
, and supports storage expansion via microSD card (up to 8GB). The Karbonn K21+ is a dual-SIM (GSM and GSM) mobile that accepts Regular and Regular cards. It was launched in Silver and Black colours.
Connectivity options on the Karbonn K21+ include FM radio.
As of 14th December 2025, Karbonn K21+ price in India starts at Rs. 1,600.
| Brand | Karbonn |
| Model | K21+ |
| Price in India | ₹1,600 |
| Release date | September 2012 |
| Form factor | Bar |
| Battery capacity (mAh) | 1000 |
| Removable battery | Yes |
| Colours | Silver, Black |
| Screen size (inches) | 2.20 |
| Touchscreen | No |
| Resolution | 128x160 pixels |
| Processor | one-core |
| Processor make | |
| Expandable storage | Yes |
| Expandable storage type | microSD |
| Expandable storage up to (GB) | 8 |
| Rear camera | 0.3-megapixel |
| Front camera | No |
| Wi-Fi | No |
| GPS | No |
| Bluetooth | Yes |
| NFC | No |
| Infrared | No |
| USB OTG | No |
| FM | Yes |
| Number of SIMs | 2 |
| Wi-Fi Direct | No |
| Mobile High-Definition Link (MHL) | No |
| SIM 1 | |
| SIM Type | Regular |
| GSM/CDMA | GSM |
| 3G | No |
| 4G/ LTE | No |
| Supports 4G in India (Band 40) | No |
| SIM 2 | |
| SIM Type | Regular |
| GSM/CDMA | GSM |
| 3G | No |
| 4G/ LTE | No |
| Supports 4G in India (Band 40) | No |
| Compass/ Magnetometer | No |
| Proximity sensor | No |
| Accelerometer | No |
| Ambient light sensor | No |
| Gyroscope | No |
| Barometer | No |
| Temperature sensor | No |
Karbonn K21+
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