Phone Comparison - Karbonn A21+ vs Lenovo K3 Note vs Asus Zenfone Max ZC550KL
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| Manufacturer | Karbonn | Lenovo | Asus |
| Announced | June 2013 | March 2015 | August 2015 |
| Status | Available - July 2013 | Available - March 2015 | Available - January 2016 |
| Price | - | Rs. 9,058 ($133.21) [Similarly Priced] | Rs. 9,999 ($147.04) [Similarly Priced] |
| Colors | Black, White | Yellow, White | Black, White |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension | - |
152.6 x 76.2 x 8 mm (6.01 x 3 x 0.31 in) |
156 x 77.5 x 10.55 mm (6.14 x 3.05 x 0.42 in) |
| Weight | - | 150 g (5.29 oz) | 202 g (7.13 oz) |
| 2G Network | GSM 900 / 1800 - SIM 1 & SIM 2 | GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 TD-SCDMA 1900 / 2100 - India |
| 3G Network | HSDPA 2100 | HSDPA 850 / 900 / 1900 / 2100 TD-SCDMA 1880 / 2010 | HSDPA 850 / 900 / 1900 / 2100 TD-SCDMA 1900 / 2100 - India |
| 4G Network | - | LTE band 1(2100), 3(1800), 7(2600), 38(2600), 39(1900), 40(2300) | LTE band 1(2100), 3(1800), 38(2600), 39(1900), 40(2300), 41(2500) - India |
| Messaging | SMS, MMS, EMail, IM | SMS, MMS, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
| Build Features | Touch and Swipe Gestures | - | - |
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| OS | Android OS, v4.2 (Jelly Bean) | Android OS, v5.0 (Lollipop) | Android OS, v5.0 (Lollipop) |
| Processor | Dual-core 1 GHz, MTK 6577 | Octa-core 1.7 GHz Cortex-A53, Mediatek MT6752 | Quad-core 1.2 GHz Cortex-A53, Qualcomm MSM8916 Snapdragon 410 |
| GPU | PowerVR SGX531 | Mali-T760MP2 | Adreno 306 |
| RAM | 512 MB | 2 GB | 2 GB |
| Internal Memory | 4 GB (2.1 GB User Memory) | 16 GB | 8/16 GB |
| External Memory | microSD, up to 32 GB | microSD, up to 32 GB | microSD, up to 128 GB |
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| Type | TFT Capacitive Touchscreen | IPS capacitive touchscreen | IPS capacitive touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 5.0 inches | 5.5 inches | 5.5 inches |
| Resolution | 480 x 854 pixels (196 ppi) | 1080 x 1920 pixels (401 ppi) | 720 x 1280 pixels (267 ppi) |
| Screen-to-Body Ratio | - | 71.55% | 68.99% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | FM radio; FM recording | FM radio | Yes |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 5 MP, 2592х1944 pixels | 13 MP, 4128 x 3096 pixels | 13 MP, 4128 x 3096 pixels |
| Flash | LED flash | dual-LED (dual tone) | Dual-tone Flash |
| Features | Auto focus, Geo-tagging, Touch Focus | Auto focus, Geo-tagging, Touch Focus, Face Detection, HDR, Panorama | Geo-tagging, Laser AutoFocus, Touch Focus, Face Detection, Panorama, HDR |
| Video | Yes, 720p | 1080p@30fps | 1080p@30fps |
| Front Camera | Yes [Similar] | 5 MP [Similar] | 5 MP [Similar] |
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| GPRS | Class 12 (4+1/3+2/2+3/1+4 slots), 32 - 48 kbps | Yes | Yes |
| Edge | Class 12 | Yes | Yes |
| 3G | HSDPA, 7.2 Mbps; HSUPA, 5.76 Mbps | HSPA, TD-SCDMA, LTE, TD-LTE | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps |
| Bluetooth | Yes, v4.0 with A2DP | v4.0, A2DP, LE | v4.0, A2DP, EDR |
| Wi-Fi | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot |
| USB | Yes, microUSB v2.0 | microUSB v2.0 | microUSB v2.0 |
| GPS | Yes, with A-GPS support | Yes, with A-GPS, GLONASS | Yes, with A-GPS, GLONASS |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 4 GB (2.1 GB User Memory), 512 MB RAM | 16 GB, 2 GB RAM | 8/16 GB, 2 GB RAM |
| Expandable Storage | microSD, up to 32 GB | microSD, up to 32 GB | microSD, up to 128 GB |
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| Fingerprint | |
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| Proximity Sensor | |
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| Accelerometer Sensor | |
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| NFC | |
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| Type | Li-Ion Battery | Li-Po Battery | Non-removable Li-Po Battery |
| Capacity | 2000 mAh | 3000 mAh | 5000 mAh |
| Stand by | Up to 240 h | Up to 750 h (3G) | - |
| Talk Time | - | Up to 36 h (3G) | - |
