Phone Comparison - Nokia Lumia 730 Dual SIM vs Nokia Lumia 638 vs Xiaomi Mi 4i
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| Manufacturer | Nokia | Nokia | Xiaomi |
| Announced | September 2014 | December 2014 | April 2015 |
| Status | Available - September 2014 | Available - December 2014 | Available - April 2015 |
| Price | - | Rs. 7,999 ($117.63) [Similarly Priced] | Rs. 8,999 ($132.34) [Similarly Priced] |
| Colors | Orange, green, white, black | Black | Black, White, Blue, Yellow, Pink |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
134.7 x 68.5 x 8.9 mm (5.3 x 2.7 x 0.35 in) |
129.5 x 66.7 x 9.2 mm (5.1 x 2.63 x 0.36 in) |
138.1 x 69.6 x 7.8 mm (5.44 x 2.74 x 0.31 in) |
| Weight | 134 g (4.73 oz) | 136 g (4.8 oz) | 130 g (4.59 oz) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | - | LTE 1800 / 1900 / 2100 / 2300 / 2500 / 2600 (Bands 3, 7, 38, 39, 40, 41) | LTE |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, EMail, IM |
| Build Features | ClearBlack display | - | - |
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| OS | Microsoft Windows Phone 8.1 | Microsoft Windows Phone 8.1 | Android OS, v5.0 (Lollipop) |
| Processor | Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400 | Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400 | Quad-core 1.7 GHz Cortex-A53 & quad-core 1.0 GHz Cortex-A53, Qualcomm MSM8939 Snapdragon 615 |
| GPU | Adreno 305 | Adreno 305 | Adreno 405 |
| RAM | 1 GB | 1 GB | 2 GB |
| Internal Memory | 8 GB | 8 GB | 16/32 GB |
| External Memory | microSD, up to 128 GB | microSD, up to 128 GB | No |
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| Type | AMOLED Capacitive Touchscreen, Corning Gorilla Glass 3 | IPS LCD capacitive touchscreen, Corning Gorilla Glass 3, ClearBlack Display | IPS LCD capacitive touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 4.7 inches | 4.5 inches | 5.0 inches |
| Resolution | 720 x 1280 pixels (312 ppi) | 480 x 854 pixels (218 ppi) | 1080 x 1920 pixels (441 ppi) |
| Screen-to-Body Ratio | 66.20% | 64.43% | 71.57% |
| 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 | 6.7 MP, Carl Zeiss optics | 5 MP, 2592 х 1944 pixels | 13 MP, 4128 x 3096 pixels |
| Flash | LED flash | No | LED flash |
| Features | Auto focus, 1/3.4'' Sensor Size, Geo-tagging, Face Detection, Panorama | Auto focus, 1/4 | Auto focus, Geo-tagging, Touch Focus, Face/smile Detection, Panorama, HDR |
| Video | 1080p@30fps, stereo sound rec. | Yes | 1080p@30fps |
| Front Camera | 5 MP, 720p [Similar] | No [Similar] | 5 MP [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Up to 296 kbps | Yes | Yes |
| 3G | HSDPA, 21.1 Mbps; HSUPA, 5.76 Mbps | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps | HSPA, LTE |
| Bluetooth | v4.0, A2DP | v4.0, A2DP, LE/ apt-X after WP8 Denim update | v4.0, 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 a/b/g/n, dual-band, hotspot |
| USB | microUSB v2.0 | microUSB v2.0 | microUSB v2.0 |
| GPS | Yes, with A-GPS, GLONASS, Beidou | Yes, with A-GPS, GLONASS | Yes, with A-GPS, GLONASS |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 8 GB, 1 GB RAM | 8 GB, 1 GB RAM | 16/32 GB, 2 GB RAM |
| Expandable Storage | microSD, up to 128 GB | microSD, up to 128 GB | No |
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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 (BV-T5A) | Li-Ion Battery (BL-5H) | Li-Po Battery |
| Capacity | 2200 mAh | 1830 mAh | 3120 mAh |
| Stand by | Up to 600 h | - | - |
| Talk Time | Up to 22 h (2G) Up to 17 h (3G) |
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