Mainstream support for Windows Phone 8.1 has ended
 

If you're still rocking a handset running Windows Phone 8.1, it is important to note that mainstream support for the operating system is ending tomorrow, as Microsoft previously announced. Prior to the availability of Windows 10 Mobile for select handsets, the last major update to Windows Phone 8.1 was Lumia Denim, which started rolling out way back in December 2014. A select number of handsets can get Windows 10 Mobile, but the vast majority of users (about 80%) are running Windows Phone 8.1. So, headlines that state Windows Phone died yesterday are clickbait - but only because Windows Phone died years ago.

http://osnews.com/story/29917/Mainst..._8_1_has_ended