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Celkon A21
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| Announced | 2014 |
| Status | Available. Released 2014 |
| Technology | GSM / HSPA |
| 2G | GSM 900 / 1800 - SIM 1 & SIM 2 |
| 3G | HSDPA 2100 |
| Speed | HSPA |
| GPRS | Yes |
| Edge | Yes |
| Dimensions | 124.8 x 66.1 x 10.8 mm (4.91 x 2.60 x 0.43 in) |
| Weight | 115.3 g (4.06 oz) |
| SIM | Dual SIM (Dual stand-by) |
| Type | Capacitive touchscreen |
| Size | 4.0 inches (~57.8% screen-to-body ratio) |
| Resolution | 320 x 480 pixels (~144 ppi pixel density) |
| OS | Android OS, v4.2.2 (Jelly Bean) |
| Chipset | Mediatek MT6582 |
| CPU | Quad-core 1.3 GHz Cortex-A7 |
| GPU | Mali-400MP2 |
| Card Slot | microSD, up to 32 GB |
| Internal | 512 MB, 256 MB RAM |
| Primary | 3.15 MP |
| Video | Yes |
| Secondary | 1.3 MP |
| Alert types | Vibration; MP3, WAV ringtones |
| Loudspeaker | Yes |
| 3.5mm Jack | Yes |
| WLAN | Yes |
| Bluetooth | v4.0 |
| GPS | No |
| Radio | FM radio |
| USB | Yes |
| Sensors | Accelerometer |
| Messaging | SMS (threaded view), MMS, Email |
| Browser | HTML |
| Java | No |
| Battery | Li-Ion 1500 mAh battery |
| Stand-by | Up to 120 h (3G) |
| Talk time | Up to 8 h (3G) |
| Colors | Black, Blue, Red |
| SAR EU | 0.99 W/kg (head)     1.39 W/kg (body)     |
| Price group | 2/10 (About 60 EUR) |