The Lumia 640 is an upgrade and the predecessor  of the Lumia 635 which comes with many preloaded features and also much processing speed (clock rate) of 1.2GHz and also an additional storage space courtesy of OneDrive a Microsoft cloud storage platform. Lumia 640 Dual Sim comes with a 1GB RAM giving it the power to run many applications with ease.

Lumia 640 Dual Sim

Camera Specifications
Want to relive your favorite moments? Capture all of them with superb quality and ease using the Lumia Camera app and 8 MP rear camera. Autofocus with a LED flash. It also has a 4x digital zoom. And with the wide-angle, 0.9MP front-facing camera, let your family and friends see more of your surroundings clearly in your free HD The secondary camera makes you able to Skype and also perform video calls.

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Display and Design
Lumia 640 comes with 5″ (12.7 cm) HD display with a display resolution: HD720 (1280 x 720)
Lumia 640 Dual Sim utilizes the ClearBlack, IPS LCD display technology with a pixel density of 294 ppi.
Sunlight readability enhancements, Corning® Gorilla® Glass 3, Easy to clean, Lumia
Color profile. Touch screen technology used on the Lumia 640 is Capacitive Multipoint-Touch

The Lumia 640 Dual Sim runs on Windows Phone 8.1 with Lumia Denim and comes with a  quad-core Qualcomm® Snapdragon™ 400 processor with a processing speed of 1.2GHz

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Memory and Storage
Lumia 640 comes with 1GB RAM and 8GB internal storage space. However, this is not the user available space for it contains some preloaded apps.
Expandable Memory of up to 128GB MicroSD card.
Also you get 15GB of OneDrive storage and also an additional 15GB after activation Cam Roll on your Lumia 640.

Lumia 640 Dual Sim has the capability of using two sim cards and this gives you the power of not being offline if you got two kinds of similar cards.

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Lumia 640 Dual Sim boasts of a 2500mAh. This battery capacity makes it more or less stand out due to it’s lasting duration as compared to other phones.
Maximum talk time on the 3G network of upto 20.3 h and the maximum standby time with dual SIM of 35 days.

The Lumia 640 is not available at the moment. It is being worked on at Microsoft and soon it will be launched