[10] The Lumia 640 and 640 XL were unveiled at Microsoft's event at the Mobile World Congress in Barcelona, Spain on March 2, 2015.

The Lumia 640 comes with a 5-inch HD IPS LCD display with Corning Gorilla Glass 3 protection and oleophobic (fingerprint-resistant) coating.

[13] It is available in glossy cyan, orange, and white, along with matte-texture black.

The 640 XL is equipped with the same basic hardware and network connectivity specifications as the Lumia 640, but features a Zeiss-engineered 13 MP (1/3.0″ sensor) rear camera with LED flash, as well as a 5MP wide-angle front-facing camera.

[15] Initially in the United States, the Lumia 640 and 640 XL were offered with a free one-year subscription to Microsoft Office 365.