The mid-range Microsoft Lumia 640 Windows Phone 8.1 smartphone is now officially available for purchase unlocked and SIM-free in the UK, straight from the Microsoft Store.

Microsoft officially took the wraps off its Lumia 640 and Lumia 640 XL mid-rangers back in early March at the Mobile World Congress (MWC) 2015, aiming to attract more budget-conscious shoppers to its platform. The company wants to focus on affordable devices for now in order to boost its market share, and its latest Lumias stand proof of such endeavors.

The Lumia 640 and Lumia 640 XL went up for pre-order on the Microsoft Store in the UK back in mid-March, and the Lumia 640 is now officially available for purchase from the company's online store.

The Microsoft Lumia 640 sports a price tag of £169.99 (including VAT) unlocked and SIM-free, but seems to be available only in black and orange color options for now. The smartphone debuted in multiple color options at the MWC, and Microsoft might add more avatars soon.

When it comes to specifications, the Microsoft Lumia 640 features a 5-inch LCD display with an HD resolution of 1280 x 720 pixels and has a Qualcomm Snapdragon 400 processor under the hood, clocked at 1.2GHz and paired with 1GB of RAM.

Other specifications include 8GB of internal storage, expandable up to 128GB via microSD, an 8-megapixel rear camera, a 0.9-megapixel front shooter, and a 2,500 mAh battery. On the software side, the handset ships with Windows Phone 8.1 and Lumia Denim and will receive an update to the latest Windows 10 once it's ready to roll out. Moreover, Microsoft is also throwing in a free one-year subscription to Office 365 to further sweeten the deal.

Upon unveiling the smartphone, Microsoft said the Lumia 640 was a "productivity workhorse," touting that it's "for the doers."

"Lumia 640 takes productivity to the next level by giving you greater flexibility to accomplish more on the go, making it a perfect choice for those who wish to increase their productivity without breaking the bank or for people who wish do more with their smartphones," Microsoft said in its original announcement in early March.

Check out the video below to learn more about the Lumia 640, or head over to the Microsoft Store at this link to purchase the smartphone in the UK.