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| key specs | ||||
| Display | 5.00-inch | 5.70-inch | 5.70-inch | 4.50-inch |
| Processor | Qualcomm Snapdragon 400 | Qualcomm Snapdragon 400 | Qualcomm Snapdragon 400 | Qualcomm Snapdragon 400 |
| Front Camera | 0.9-megapixel | 5-megapixel | 5-megapixel | No |
| Rear Camera | 8-megapixel | 13-megapixel | 13-megapixel | 5-megapixel |
| RAM | 1GB | 1GB | 1GB | 1GB |
| Storage | 8GB | 8GB | 8GB | 8GB |
| Battery Capacity | 2500mAh | 3120mAh | 3000mAh | 1830mAh |
| OS | Windows Phone 8.1 | Windows Phone 8.1 | Windows Phone 8.1 | Windows Phone 8.1 |
| Resolution | 720x1280 pixels | 720x1280 pixels | 720x1280 pixels | 480x854 pixels |
| general | ||||
| Brand | Microsoft | Microsoft | Microsoft | Nokia |
| Model | Lumia 640 Dual SIM | Lumia 640 XL LTE Dual SIM | Lumia 640 XL Dual SIM | Lumia 638 |
| Release date | February 1, 2015 | March 1, 2015 | March 1, 2015 | June 1, 2014 |
| Form factor | Touchscreen | Touchscreen | Touchscreen | Touchscreen |
| Dimensions (mm) | 141.30 x 72.20 x 8.80 | 157.90 x 81.50 x 9.00 | 157.90 x 81.50 x 9.00 | 129.50 x 66.70 x 9.20 |
| Weight (g) | 145.00 | 171.00 | 171.00 | - |
| Battery capacity (mAh) | 2500 | 3120 | 3000 | 1830 |
| Removable battery | Yes | Yes | Yes | No |
| Colours | - | - | - | Orange, Black, Yellow, White |
| display | ||||
| Screen size (inches) | 5.00 | 5.70 | 5.70 | 4.50 |
| Touchscreen | Yes | Yes | Yes | Yes |
| Resolution | 720x1280 pixels | 720x1280 pixels | 720x1280 pixels | 480x854 pixels |
| Pixels per inch (PPI) | 294 | 259 | 259 | - |
| hardware | ||||
| Processor | 1.2GHz quad-core | 1.2GHz quad-core | 1.2GHz quad-core | 1.2GHz quad-core |
| Processor make | Qualcomm Snapdragon 400 | Qualcomm Snapdragon 400 | Qualcomm Snapdragon 400 | Qualcomm Snapdragon 400 |
| RAM | 1GB | 1GB | 1GB | 1GB |
| Internal storage | 8GB | 8GB | 8GB | 8GB |
| Expandable storage | Yes | Yes | Yes | Yes |
| Expandable storage type | microSD | microSD | microSD | - |
| Expandable storage up to (GB) | 128 | 128 | 128 | 128 |
| camera | ||||
| Rear camera | 8-megapixel | 13-megapixel | 13-megapixel | 5-megapixel |
| Rear flash | LED | LED | LED | No |
| Front camera | 0.9-megapixel | 5-megapixel | 5-megapixel | No |
| software | ||||
| Operating system | Windows Phone 8.1 | Windows Phone 8.1 | Windows Phone 8.1 | Windows Phone 8.1 |
| connectivity | ||||
| Wi-Fi | Yes | Yes | Yes | Yes |
| Wi-Fi standards supported | 802.11 b/g/n | 802.11 b/g/n | 802.11 b/g/n | 802.11 b/g/n |
| GPS | Yes | Yes | Yes | Yes |
| Bluetooth | Yes | Yes, v 4.00 | Yes, v 4.00 | Yes |
| NFC | No | Yes | Yes | No |
| Infrared | No | No | No | No |
| USB OTG | No | No | No | No |
| Headphones | 3.5mm | 3.5mm | 3.5mm | 3.5mm |
| FM | Yes | Yes | Yes | No |
| Number of SIMs | 2 | 2 | 2 | 1 |
| Wi-Fi Direct | No | Yes | No | No |
| Mobile High-Definition Link (MHL) | No | No | No | No |
| sim 1 | ||||
| SIM Type | Micro-SIM | Micro-SIM | Micro-SIM | - |
| GSM/CDMA | GSM | GSM | GSM | GSM |
| 3G | Yes | Yes | Yes | Yes |
| 4G/ LTE | No | Yes | No | Yes |
| sim 2 | ||||
| SIM Type | Micro-SIM | Micro-SIM | Micro-SIM | - |
| GSM/CDMA | GSM | GSM | GSM | - |
| 3G | Yes | Yes | Yes | - |
| 4G/ LTE | No | Yes | No | - |
| sensors | ||||
| Compass/ Magnetometer | Yes | Yes | Yes | No |
| Proximity sensor | Yes | Yes | Yes | No |
| Accelerometer | Yes | Yes | Yes | No |
| Ambient light sensor | Yes | Yes | Yes | No |
| Gyroscope | No | No | No | No |
| Barometer | No | No | No | No |
| Temperature sensor | No | No | No | No |
| ratings | ||||
| Overall NDTV Rating | - | - | Read Review | - |
| Design Rating | - | - | - | |
| Display Rating | - | - | - | |
| Software Rating | - | - | - | |
| Performance Rating | - | - | - | |
| Battery Life Rating | - | - | - | |
| Camera Rating | - | - | - | |
| Value for Money Rating | - | - | - | |