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| Screenshot Karbonn X21 | 
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 OS: Android v10 CPU: 1.6 GHz, Octa Core Processor RAM: 2 GB Display: 5.45 inches, 1440 x 720 pixels Camera: 8 MP with autofocus Battery: 3000 mAh  | 
| Hardware and OS Karbonn X21 | |
| Operating System: | Android v10 | 
| Processor: | 1.6 GHz, Octa Core Processor | 
| Chipset: | Unisoc SC9863 | 
| RAM: | 2 GB | 
| Internal Memory: | 32 GB | 
| Memory Card Slot: | Yes, upto 256 GB | 
| Dual Sim: | Yes | 
| Sim Size: | Nano Nano SIM | 
| Sim Type: | Dual Sim, GSM GSM | 
| Display Karbonn X21 | |
| Screen Size: | 5.45 inches, 1440 x 720 pixels | 
| Display Type: | Color HD FullView Display | 
| Pixel Density: | ~295 PPI | 
| Touch Screen: | Yes, with Multitouch | 
| Display aspect ratio: | 18:9 | 
| Connectivity Karbonn X21 | |
| 3G Network: | Yes | 
| 4G Network: | Yes | 
| Bluetooth: | Yes, v4.2 | 
| EDGE: | Yes | 
| GPRS: | Yes | 
| GPS: | Yes | 
| USB: | Yes, microUSB | 
| USB Features: | USB on-the-go, USB Charging | 
| VoLTE: | Yes | 
| Wifi: | Yes, with wifi-hotspot | 
| Camera Karbonn X21 | |
| Main camera: | 8 MP with autofocus | 
| Video Recording: | 1080p | 
| Flash: | Yes, LED | 
| Selfie camera: | 5 MP with LED Flash | 
| Features: | Panorama, Burst Mode, Time Lapse, Face Beauty, Night Mode | 
| Multimedia Karbonn X21 | |
| Headphone jack: | Yes | 
| Email: | Yes | 
| FM Radio: | Yes | 
| Music: | Yes | 
| Video: | Yes | 
| Browser: | Yes | 
| Java: | No | 
| Design Karbonn X21 | |
| Dimensions: | 147.5 x 71.8 x 9.35 mm | 
| Weight: | 160 g | 
| Battery Karbonn X21 | |
| Battery capacity: | 3000 mAh | 
| Type: | Removable Battery | 
| Reverse Charging: | Yes | 
| Zab-Bikasa | March 12, 2024 | |
| I appreciate the simplicity and reliability of my feature phone. It has a long-lasting battery, clear display, and dual SIM capabilities. | ||
| Reply         | ||
| Solivu | May 05, 2024 | |
| Limited features, outdated technology, slow performance, small internal storage. | ||
| Reply         | ||
| Ccnlzj$ | May 09, 2024 | |
| Great phone, fast and reliable OS. | ||
| Reply         | ||