Phone Comparison - LG Optimus 4X HD vs Microsoft Lumia 640 Dual SIM vs Samsung Galaxy On7
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| Manufacturer | LG | Microsoft | Samsung |
| Announced | February 2012 | March 2015 | October 2015 |
| Status | Available - June 2012 | Available - April 2015 | Available - November 2015 |
| Price | - | Rs. 8,999 ($132.34) [Similarly Priced] | Rs. 8,990 ($132.21) [Similarly Priced] |
| Colors | Black | Yes | White, Black |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
132.4 x 68.1 x 8.9mm (5.21 x 2.68 x 0.35in) |
141.3 x 72.2 x 8.8 mm (5.56 x 2.84 x 0.35 in) |
151.8 x 77.5 x 8.2 mm (5.98 x 3.05 x 0.32 in) |
| Weight | 133 g (4.69 oz) | 145 g (5.11 oz) | 172 g (6.07 oz) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 900 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 | HSDPA |
| 4G Network | - | - | LTE |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, EMail, IM |
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| OS | Android OS, v4.0 (Ice Cream Sandwich) | Microsoft Windows Phone 8.1 with Lumia Denim | Android OS, v5.1 (Lollipop) |
| Processor | Quad-core 1.5 GHz Cortex-A9, Nvidia Tegra 3 | Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400 | Quad-core 1.2 GHz, Qualcomm MSM8916 Snapdragon 410 |
| GPU | ULP GeForce | Adreno 305 | Adreno 306 |
| RAM | 1 GB | 1 GB | 1.5 GB |
| Internal Memory | 16 GB storage | 8 GB | 8 GB |
| External Memory | Upto 16 GB | microSD, up to 128 GB | microSD, up to 128 GB |
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| Type | HD-IPS LCD capacitive touchscreen | IPS LCD Capacitive Touchscreen, Corning Gorilla Glass 3, ClearBlack Display | TFT capacitive touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 4.7 inches | 5.0 inches | 5.5 inches |
| Resolution | 720 x 1280 pixels (312 ppi) | 720 x 1280 pixels (294 ppi) | 720 x 1280 pixels (267 ppi) |
| Screen-to-Body Ratio | 67.74% | 67.43% | 70.89% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | Yes | FM radio | Yes, FM Radio |
| Games | Yes | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 8 MP, 3264x2448 pixels | 8 MP, 3264 x 2448 pixels | 13 MP, 4128 x 3096 pixels |
| Flash | LED flash | LED flash | LED flash |
| Features | Auto focus, Geo-tagging, Face And Smile Detection, Touch Focus, Image Stabilization | Auto focus, 1/4'' Sensor Size | Auto focus, Geo-tagging, Touch Focus, Face Detection |
| Video | Yes, 1080p@30fps | 1080p@30fps | 1080p@30fps |
| Front Camera | Yes, 1.3 MP [Similar] | 1 MP, 720p [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, 21 Mbps; HSUPA, 5.76 Mbps | HSPA 42.2/5.76 Mbps | HSPA, LTE |
| Bluetooth | Yes, with A2DP | v4.0, A2DP | v4.1, A2DP |
| Wi-Fi | Wi-Fi 802.11 b/g/n, DLNA, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, DLNA, hotspot | Wi-Fi 802.11 b/g/n, hotspot |
| USB | Yes, microUSB (MHL) v2.0 | microUSB v2.0 | microUSB v2.0 |
| GPS | Yes, with A-GPS support | Yes, with A-GPS, GLONASS, Beidou | Yes, with A-GPS, GLONASS |
| Browser | HTML5, Adobe Flash | HTML5 | HTML5 |
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| Internal | 16 GB storage, 1 GB RAM | 8 GB, 1 GB RAM | 8 GB, 1.5 GB RAM |
| Expandable Storage | Yes | microSD, up to 128 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 | Standard battery, Li-Ion | Li-Ion Battery | Li-Ion Battery |
| Capacity | 2150 mAh | 2500 mAh | 3000 mAh |
| Stand by | Up to 730 h (2G) Up to 686 h (3G) |
Up to 840 h (2G) Up to 840 h (3G) |
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| Talk Time | Up to 9 h 20 min (2G) Up to 10 h 50 min (3G) |
Up to 27 h 30 min (2G) Up to 20 h 30 min (3G) |
Up to 11 h (3G) |
