Phone Comparison - Nokia Lumia 635 vs Samsung Galaxy Ace 4 vs Microsoft Lumia 550
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| Manufacturer | Nokia | Samsung | Microsoft |
| Announced | April 2014 | June 2014 | October 2015 |
| Status | Available - May 2014 | Available - July 2014 | Available - December 2015 |
| Price | - | - | Rs. 7,999 ($117.63) [Similarly Priced] |
| Colors | Orange, Yellow, White, Black | Iris Charcoal, Classic White | Black, White |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
129.5 x 66.7 x 9.2 mm (5.1 x 2.63 x 0.36 in) |
121.4 x 62.9 x 10.8 mm (4.78 x 2.48 x 0.43 in) |
136.1 x 67.8 x 9.9 mm (5.36 x 2.67 x 0.39 in) |
| Weight | 134 g (4.73 oz) | 123.8 g (4.34.0.28 oz) | 141.9 (4.97.0.32) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 900 / 2100 | HSDPA 850 / 900 / 2100 |
| 4G Network | LTE | - | LTE band 1(2100), 3(1800), 7(2600), 8(900), 20(800) |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
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| OS | Microsoft Windows Phone 8.1 | Android OS, v4.4.2 (KitKat) | Microsoft Windows 10 |
| Processor | Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400 | Dual-core 1.0 GHz | Quad-core 1.1 GHz Cortex-A7, Qualcomm MSM8909 Snapdragon 210 |
| GPU | Adreno 305 | - | Adreno 304 |
| RAM | 512 MB | 512 MB | 1 GB |
| Internal Memory | 8 GB | 4 GB | 8 GB |
| External Memory | microSD, up to 64 GB | microSD, up to 64 GB | microSD, up to 200 GB |
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| Type | IPS LCD capacitive touchscreen | TFT capacitive touchscreen | Capacitive touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 4.5 inches | 4.0 inches | 4.7 inches |
| Resolution | 480 x 854 pixels (218 ppi) | 480 x 800 pixels (233 ppi) | 720 x 1280 pixels (315 ppi) |
| Screen-to-Body Ratio | 64.43% | 59.76% | 64.94% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | No | FM radio | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 5 MP, 2592 х 1944 pixels | 5 MP, 2592 х 1944 pixels | 5 MP, 2592 х 1944 pixels |
| Flash | No | LED flash | LED flash |
| Features | Geo-tagging | Auto focus, Geo-tagging, Face And Smile Detection, Panorama | Auto focus, 1/4' Sensor Size, Geo-tagging, Touch Focus |
| Video | Yes, 720p@30fps | Yes, 720p@30fps | 720p@30fps |
| Front Camera | No [Similar] | Yes, VGA [Similar] | 2 MP, 480p [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSDPA, 21 Mbps; HSUPA, 5.76 Mbps; LTE, Cat3, 50 Mbps UL, 100 Mbps DL | HSDPA, 21 Mbps; HSUPA, 5.76 Mbps | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps |
| Bluetooth | Yes, v4.0 with A2DP | Yes, v4.0 with A2DP | v4.1, A2DP |
| Wi-Fi | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, hotspot |
| USB | Yes, microUSB v2.0 | Yes, microUSB v2.0 | microUSB v2.0 |
| GPS | Yes, with A-GPS support and GLONASS | Yes, with A-GPS support and GLONASS | Yes, with A-GPS, GLONASS, Beidou |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 8 GB, 512 MB RAM | 4 GB, 512 MB RAM | 8 GB, 1 GB RAM |
| Expandable Storage | microSD, up to 64 GB | microSD, up to 64 GB | microSD, up to 200 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-Ion Battery | Li-Ion Battery |
| Capacity | 1830 mAh | 1500 mAh | 2100 mAh |
| Stand by | Up to 648 h | - | Up to 672 h (2G) Up to 672 h (3G) |
| Talk Time | Up to 12 h (2G) Up to 14 h (3G) |
- | Up to 16 h (2G) Up to 14 h (3G) |
