Phone Comparison - Nokia Lumia 635 vs Nokia 225 Dual SIM vs Nokia Lumia 638
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| Manufacturer | Nokia | Nokia | Nokia |
| Announced | April 2014 | April 2014 | December 2014 |
| Status | Available - May 2014 | Coming Soon - Q2 2014 | Available - December 2014 |
| Price | - | - | Rs. 7,999 ($117.63) [Similarly Priced] |
| Colors | Orange, Yellow, White, Black | Various | Black |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
129.5 x 66.7 x 9.2 mm (5.1 x 2.63 x 0.36 in) |
124 x 55.5 x 10.4 mm (4.88 x 2.19 x 0.41 in) |
129.5 x 66.7 x 9.2 mm (5.1 x 2.63 x 0.36 in) |
| Weight | 134 g (4.73 oz) | 100.6 g (3.53.0.21 oz) | 136 g (4.8 oz) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | No | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | LTE | - | LTE 1800 / 1900 / 2100 / 2300 / 2500 / 2600 (Bands 3, 7, 38, 39, 40, 41) |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
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| OS | Microsoft Windows Phone 8.1 | Nokia OS Series 30+ | Microsoft Windows Phone 8.1 |
| Processor | Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400 | - | Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400 |
| GPU | Adreno 305 | - | Adreno 305 |
| RAM | 512 MB | N/A | 1 GB |
| Internal Memory | 8 GB | - | 8 GB |
| External Memory | microSD, up to 64 GB | microSD, up to 32 GB | microSD, up to 128 GB |
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| Type | IPS LCD capacitive touchscreen | TFT | IPS LCD capacitive touchscreen, Corning Gorilla Glass 3, ClearBlack Display |
| Colors | 16M colors | 256K colors | 16M colors |
| Size | 4.5 inches | 2.8 inches | 4.5 inches |
| Resolution | 480 x 854 pixels (218 ppi) | 240 x 320 pixels (143 ppi) | 480 x 854 pixels (218 ppi) |
| Screen-to-Body Ratio | 64.43% | 35.21% | 64.43% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | No | Stereo 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 | 2 MP, 1600 x 1200 pixels | 5 MP, 2592 х 1944 pixels |
| Flash | No | No | No |
| Features | Geo-tagging | 1/5' Sensor Size | Auto focus, 1/4 |
| Video | Yes, 720p@30fps | Yes, QVGA@15fps | Yes |
| Front Camera | No [Similar] | No [Similar] | No [Similar] |
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| GPRS | Yes | Up to 85.6 kbps | Yes |
| Edge | Yes | Up to 236.8 kbps | Yes |
| 3G | HSDPA, 21 Mbps; HSUPA, 5.76 Mbps; LTE, Cat3, 50 Mbps UL, 100 Mbps DL | No | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps |
| Bluetooth | Yes, v4.0 with A2DP | Yes, v3.0 | v4.0, A2DP, LE/ apt-X after WP8 Denim update |
| Wi-Fi | Wi-Fi 802.11 b/g/n | No | Wi-Fi 802.11 b/g/n, DLNA, hotspot |
| USB | Yes, microUSB v2.0 | Yes, microUSB v2.0 | microUSB v2.0 |
| GPS | Yes, with A-GPS support and GLONASS | No | Yes, with A-GPS, GLONASS |
| Browser | HTML5 | WAP 2.0/xHTML | HTML5 |
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| Phonebook | Practically unlimited entries and fields, Photocall | 1000 entries | Practically unlimited entries and fields, Photocall |
| Call Records | Practically unlimited | Yes | Practically unlimited |
| Internal | 8 GB, 512 MB RAM | - | 8 GB, 1 GB RAM |
| Expandable Storage | microSD, up to 64 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-Ion Battery (BL-4UL) | Li-Ion Battery (BL-5H) |
| Capacity | 1830 mAh | 1200 mAh | 1830 mAh |
| Stand by | Up to 648 h | Up to 648 h | - |
| Talk Time | Up to 12 h (2G) Up to 14 h (3G) |
Up to 21 h | - |
