Developer you can update your personal phone(s) to run Windows Phone 8.1 using the Windows Phone Preview for Developers program.
Along with the tooling delivered in Visual Studio 2013 Update 2 RC, developers can now get everything they need to start building and testing Windows Phone apps and universal Windows apps. Even better, Windows Phone Store is also starting to accept app submissions and to enable app linking today – enabling you to bring the universal Windows app experience to your beta users and consumers.
To update your Windows Phone 8 device to 8.1, you will need to download the app and opt into the program (the process is outlined on the Windows Phone Dev Center); if your phone is already opted in, then all you should need to do is head over to your phone’s settings and check for an update.
Windows Phone Preview for Developers program
The Windows Phone Preview program gives our developer community access to prerelease builds of Windows Phone updates before the operating system updates are made generally available to consumers.
Participation requirements for the Windows Phone Preview program is simple, you must meet one of the following three criteria:
(a) you’re a registered developer on the Windows Phone Dev Center, or
(b) you’re a registered developer with Windows App Studio, or (c) your phone is developer unlocked (which anyone can do using the developer phone registration tool, which is included as part of the Windows Phone tooling).
As mentioned above, check out the Windows Phone Preview Program for Developers page for full details. If you have any further questions or encounter an issue while updating your phone, we have a team of update experts monitoring the program’s support forums – ask a question in the support forum, and someone should be able to help you out.
Support and References
Update your Windows Phone to 8.1 update your phone
Watch the Build 2014 Windows Phone Resources session content available