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key specs | ||||
Display | 5.00-inch | 4.70-inch | 4.50-inch | |
Processor | Qualcomm Snapdragon 400 | Qualcomm Snapdragon 400 | Qualcomm Snapdragon 400 | |
Front Camera | 0.9-megapixel | 5-megapixel | No | |
Rear Camera | 8-megapixel | 6.7-megapixel | 5-megapixel | |
RAM | 1GB | 1GB | 1GB | |
Storage | 8GB | 8GB | 8GB | |
Battery Capacity | 2500mAh | 2220mAh | 1830mAh | |
OS | Windows Phone 8.1 | Windows Phone 8.1 | Windows Phone 8.1 | |
Resolution | 720x1280 pixels | 720x1280 pixels | 480x854 pixels | |
general | ||||
Brand | Microsoft | Nokia | Nokia | |
Model | Lumia 640 Dual SIM | Lumia 730 Dual SIM | Lumia 638 | |
Release date | February 1, 2015 | September 1, 2014 | June 1, 2014 | |
Form factor | Touchscreen | Touchscreen | Touchscreen | |
Dimensions (mm) | 141.30 x 72.20 x 8.80 | 134.70 x 68.50 x 8.70 | 129.50 x 66.70 x 9.20 | |
Weight (g) | 145.00 | 130.40 | - | |
Battery capacity (mAh) | 2500 | 2220 | 1830 | |
Removable battery | Yes | Yes | No | |
Colours | - | green, orange, white and black | Orange, Black, Yellow, White | |
SAR value | - | 0.50 | - | |
display | ||||
Screen size (inches) | 5.00 | 4.70 | 4.50 | |
Touchscreen | Yes | Yes | Yes | |
Resolution | 720x1280 pixels | 720x1280 pixels | 480x854 pixels | |
Pixels per inch (PPI) | 294 | 316 | - | |
hardware | ||||
Processor | 1.2GHz quad-core | 1.2GHz quad-core | 1.2GHz quad-core | |
Processor make | Qualcomm Snapdragon 400 | Qualcomm Snapdragon 400 | Qualcomm Snapdragon 400 | |
RAM | 1GB | 1GB | 1GB | |
Internal storage | 8GB | 8GB | 8GB | |
Expandable storage | Yes | Yes | Yes | |
Expandable storage type | microSD | microSD | - | |
Expandable storage up to (GB) | 128 | 128 | 128 | |
camera | ||||
Rear camera | 8-megapixel | 6.7-megapixel | 5-megapixel | |
Rear flash | LED | LED | No | |
Front camera | 0.9-megapixel | 5-megapixel | No | |
software | ||||
Operating system | Windows Phone 8.1 | Windows Phone 8.1 | Windows Phone 8.1 | |
connectivity | ||||
Wi-Fi | Yes | Yes | Yes | |
Wi-Fi standards supported | 802.11 b/g/n | 802.11 b/g/n | 802.11 b/g/n | |
GPS | Yes | Yes | Yes | |
Bluetooth | Yes | Yes, v 4.00 | Yes | |
NFC | No | Yes | No | |
Infrared | No | No | No | |
USB OTG | No | No | No | |
Headphones | 3.5mm | 3.5mm | 3.5mm | |
FM | Yes | Yes | No | |
Number of SIMs | 2 | 2 | 1 | |
Wi-Fi Direct | No | No | No | |
Mobile High-Definition Link (MHL) | No | No | No | |
sim 1 | ||||
SIM Type | Micro-SIM | Micro-SIM | - | |
GSM/CDMA | GSM | GSM | GSM | |
3G | Yes | Yes | Yes | |
4G/ LTE | No | No | Yes | |
sim 2 | ||||
SIM Type | Micro-SIM | Micro-SIM | - | |
GSM/CDMA | GSM | GSM | - | |
3G | Yes | Yes | - | |
4G/ LTE | No | No | - | |
sensors | ||||
Compass/ Magnetometer | Yes | Yes | No | |
Proximity sensor | Yes | Yes | No | |
Accelerometer | Yes | Yes | No | |
Ambient light sensor | Yes | Yes | No | |
Gyroscope | No | No | No | |
Barometer | No | No | No | |
Temperature sensor | 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 | - | - |