Microsoft began delivering updates on Windows Phone 8 a month ago, with updates to Windows Phone 8.1 many WP8 users are experiencing new and more interesting features. Though the update is on PREVIEW version, Windows Phone 8.1 Preview for Developers version introduces many new features including an awesome assistance app Cortana (Beta).
Windows phone 8.1 to 10 update any chance - Microsoft May 20, 2020 Windows Phone 8.1 Update 1 | Windows Central Aug 04, 2014 On Windows Phone 8.1? No more app store for you after Oct 16, 2019
Update to Windows 8.1 from Windows 8 - Windows Help
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Windows 10 Mobile: Now you can update your phone from your Oct 23, 2017 How to download and install the Windows Phone 8.1 update Apr 16, 2014 Upgrade guide for Windows Phone 8.1 - Microsoft