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A man is silhouetted against a video screen as he poses with a Nokia Lumia 820 smartphone in this photo illustration taken in the central Bosnian town of ZenicaReuters

Rumoured Microsoft Lumia 640 smartphone specifications have been leaked ahead of its launch next month.

Technology blog Nokia Power User while leafing through the FCC (Federal Communications Commission), a US government owned telecommunications certification agency website, unearthed a document containing key details of the speculated Microsoft Lumia 640.

According to the document, Lumia 640 is said to sport a 5.0-inch HD screen and ship a Snapdragon 400 series quad-core SoC (System on Chip), Adreno 305 graphics engine, 1GB RAM and 8GB inbuilt memory (expandable).

On the photography front, it is expected to feature a 8.7-megapixel camera (most probably boasting PureView sensor technology) and a 0.9-megapixel snapper on the front for video chatting via Skype.

It is learnt that Lumia 640 might be priced around $275 (approximately €242/₹17,000) and is likely to debut along with Lumia 1330, understood to be the successor of Lumia 1320 at the MWC (Mobile World Congress) 2015, Barcelona.

As per reports, Lumia 1330 will sport a 5.7-inch HD screen, 0.3-inches smaller than its predecessor 1320, which flaunted a mammoth 6.0-inch screen. On the bright side, the compact screen will provide a richer display thanks to an increase in pixel density.

Other specifications include Windows Phone 8.1 with GDR2 (General Distribution Release 2) update, 32GB in-built memory capacity, Snapdragon 400 series quad-core SoC (System on Chip), Adreno 305 graphics engine and 1GB RAM.

One noticeable improvement in the Lumia 1330 over its predecessor is that it will house a feature-rich 14.0-megapixel PureView camera and a 5.0 megapixel snapper at the front. Lumia 1320 had a very mediocre camera specification – 5.0 megapixel rear-side camera and a VGA (0.3 megapixel) front camera.

Speculated specifications of Lumia 640 and Lumia 1330:

Model Lumia 640 Lumia 1330
Display 5.0-inch HD (1280x720p) resolution screen 5.7-inch HD (1280x720p) screen
OS Windows 8.1 (most likely with Lumia Denim update) Windows Phone 8.1 with GDR2 (General Distribution Release)update
Processor Snapdragon quad-core CPU Snapdragon quad-core CPU
GPU Adreno 305 Adreno 305
Storage 8GB, expandable via microSD card 32GB
Camera Main: 8.7-megapixel cameraFront: 0.9-megapixel camera Main: 14.0-megapixel PureView cameraFront: 5.0-megapixel camera with fixed-focus
Battery BT-T5C type Yet to ascertained
Add-ons NFC, dual-SIM, Wireless charging support, LTE Single SIM, Dual-SIM (optional model)