As a Windows developer, you can preview Windows Phone 8.1 system updates before mobile providers make them available to customers. With these updates, you can test and validate your apps onyour development phone to make sure they work correctly when the updates are offically released to all customers. If you want to ujump ahead and start trying out upcoming Windows 10 features, join the Windows Insider Program.
Not a developer? No problem. If you're looking for a sneak peek at the Windows 10 experience for phones, find out how to get the latest updates for your phone.