Phone Comparison - Nokia Lumia 925 vs Nokia Lumia 830 vs Nokia Lumia 638
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| Manufacturer | Nokia | Nokia | Nokia |
| Announced | May 2013 | September 2014 | December 2014 |
| Status | Available - June 2013 | Available - September 2014 | Available - December 2014 |
| Price | - | - | Rs. 7,999 ($117.63) [Similarly Priced] |
| Colors | Black, White | Orange, green, white, black | Black |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
129 x 70.6 x 8.5 mm (5.08 x 2.78 x 0.33 in) |
139.4 x 70.7 x 8.5 mm (5.49 x 2.78 x 0.33 in) |
129.5 x 66.7 x 9.2 mm (5.1 x 2.63 x 0.36 in) |
| Weight | 139 g (4.9 oz) | 150 g (5.29 oz) | 136 g (4.8 oz) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 - RM-892, RM-893 HSDPA 850 / 900 / 1700 / 1900 / 2100 - RM-910 |
HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | LTE 800 / 900 / 1800 / 2100 / 2600 - RM-892 LTE 700 / 1700 / 2100 - RM-893 |
LTE 800 / 900 / 1800 / 2100 / 2600 | LTE 1800 / 1900 / 2100 / 2300 / 2500 / 2600 (Bands 3, 7, 38, 39, 40, 41) |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
| Build Features | - | ClearBlack display | - |
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| OS | Microsoft Windows Phone 8 | Microsoft Windows Phone 8.1 | Microsoft Windows Phone 8.1 |
| Processor | Dual-core 1.5 GHz Krait, Qualcomm MSM8960 Snapdragon | Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400 | Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400 |
| GPU | Adreno 225 | Adreno 305 | Adreno 305 |
| RAM | 1 GB | 1 GB | 1 GB |
| Internal Memory | 16/32 GB storage | 16 GB | 8 GB |
| External Memory | No | microSD, up to 128 GB | microSD, up to 128 GB |
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| Type | AMOLED capacitive touchscreen | IPS LCD Capacitive Touchscreen, Corning Gorilla Glass 3 | IPS LCD capacitive touchscreen, Corning Gorilla Glass 3, ClearBlack Display |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 4.5 inches | 5.0 inches | 4.5 inches |
| Resolution | 768 x 1280 pixels (332 ppi) | 720 x 1280 pixels (294 ppi) | 480 x 854 pixels (218 ppi) |
| Screen-to-Body Ratio | 63.18% | 69.80% | 64.43% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | FM radio | FM radio | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 8.7 MP, 3264 x 2448 pixels | 10 MP, Carl Zeiss Optics | 5 MP, 2592 х 1944 pixels |
| Flash | Dual-LED flash | LED Flash | No |
| Features | PureView Technology, Geo-tagging, Touch Focus, Optical image stabilization, Still image editor, Face recognition | Auto focus, OIS, 1/3.4'' sensor size, PureView technology, geo-tagging, face detection, panorama | Auto focus, 1/4 |
| Video | Yes, 1080p@30fps, video stabilization | 1080p@30fps, optical stabilization, stereo sound rec. | Yes |
| Front Camera | Yes, 1.2 MP wide Angle, 720p@30fps [Similar] | 0.9 MP, 720p [Similar] | No [Similar] |
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| GPRS | Class 12 (4+1/3+2/2+3/1+4 slots), 32 - 48 kbps | Yes | Yes |
| Edge | Up to 236.8 kbps | Up to 296 kbps | Yes |
| 3G | HSDPA, 42.2 Mbps; HSUPA, 5.76 Mbps; LTE, Cat3, 50 Mbps UL, 100 Mbps DL | HSDPA, 42.2 Mbps; HSUPA, 5.76 Mbps; LTE, Cat4, 50 Mbps UL, 150 Mbps DL | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps |
| Bluetooth | Yes, v4.0 with A2DP, EDR | v4.0, A2DP | v4.0, A2DP, LE/ apt-X after WP8 Denim update |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n, dual-band, DLNA, Wi-Fi hotspot | Wi-Fi 802.11 a/b/g/n, DLNA, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, DLNA, hotspot |
| USB | Yes, microUSB v2.0 | microUSB v2.0 | microUSB v2.0 |
| GPS | Yes, with A-GPS support and GLONASS | Yes, with A-GPS, GLONASS, Beidou | Yes, with A-GPS, GLONASS |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 16/32 GB storage, 1 GB RAM | 16 GB, 1 GB RAM | 8 GB, 1 GB RAM |
| Expandable Storage | No | 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 | Non-removable Li-Ion Battery (BL-4YW) | Li-Ion Battery (BV-L4A) | Li-Ion Battery (BL-5H) |
| Capacity | 2000 mAh | 2200 mAh | 1830 mAh |
| Stand by | Up to 440 h (3G) | Up to 528 h | - |
| Talk Time | Up to 18 h 18 min (2G) Up to 12 h 48 min (3G) |
Up to 12 h 54 min (2G) Up to 14 h 48 min (3G) |
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