Try Windows Phone 8.1 On Smartphone
Although a few months have Windows Phone (WP) 8.1 but now you can download the trial version to experience the new features mobile operating this system.
This is the WP version for developers is not official. However, it still is full of essential features. Typically, you will need to have an account Programmers Windows Phone ( 19USD/nam ) can download the 8.1 version of WP. However, there are other ways for you to download for free and use easier.
That is on the App Studio page and log in using a Microsoft account, then create a new Project. Next to, you download the app for Preview Developers to set up equipment and log in using the Microsoft account. Meanwhile, the phone will automatically notify you had WP 8.1 update in Settings / Phone Update.
However, this approach also has some certain limit. First, your phone will temporarily lose warranty until updated to version 8.1 official WP ( in a few months ). Next to, this update only upgrade the operating system rather than upgrade the software on the machine. And finally, you will not be able to return WP 8 after update to up WP 8.1.
Windows Phone 8.1 is the biggest update of WP in 1.5 years. WP 8.1 supports many new features as virtual assistant Cortana, Private Action Center, the new lock screen, Internet Explorer 11, better VPN, the Sense app ...
WP version 8.1 for programmers do not have customization features lock screen. It is known that most of the new features of WP 8.1 will be available in all countries but the virtual assistant Cortana will only American.