screens of up to six inches, the addition of a "Driving Mode," and extra rows of live tiles for larger "phablet" devices.

The updated operating system's final name was leaked to the public when Microsoft released the Windows Phone 8.1 SDK to developers on February 10, 2014, but it wasn't until Microsoft's Build conference keynote on April 2, 2014 when Windows Phone 8.1 was officially announced, alongside the Windows 8.1 Update.