Windows 10 Technical Preview has been launched for Windows Phone-based smartphones.

Today, the Windows 10 Technical Preview has been launched for some Windows Phone-based smartphones.

Update available through Windows Insider for Nokia: Lumia 630 , Lumia 635 , Lumia 636 , Lumia 638 , Lumia 730 , Lumia 830
It was also released a video from Joe Belfiore, where he talks about Windows 10 for smartphones:

The main innovations in the story of Joe Belfiore:

1. New personalization mode with the installation of images instead of a black background.
2. Changes in the program list (new sorting options added).
3. Notification Center Updates: More Switches.
4. Interactive notifications.
5. Keyboard and text-to-speech updates.
6. Brand new universal Office, which will be pre-installed on smartphones and small tablets. Is free.
7. New mail application.
8. New calendar application.
9. Spartan Browser.
10. New photo app.
11. New maps application.
12. New Cortana features.

Microsoft warns:

• Do not use your primary phone for this. If you have a spare phone, this is an excellent option for installing Technical Preview;
• Unexpected phone crashes can damage or even delete files, so you should keep backup copies of all data on your computer. Some equipment, such as Bluetooth speakers, may not work, and the software may not be installed or work properly. There may also be problems connecting to your home or corporate network.

The remaining smartphones on Windows Phone 8.X will be able to install Windows 10 TP later, the exact date is not reported.
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UPD1: List of known faults in Windows 10, published by Microsoft:

• In the Messages application, some functions that you could use on Windows Phone 8.1 are still missing, including support for two SIM cards, search, drafts, exchange voice notes and ringing tones, support for languages ​​with right-to-left writing, help with international calls , spam filter, viewing all recipients of group mailings, reminders and the function “do not disturb” using the Cortana system, adding several attachments and support of the GSM standard. If you regularly use these features, you may need to wait until they appear in one of the subsequent builds.
• Cortana for phones is available only in English (US). In other countries, the usual search works.
• On phones with a preliminary version of the room are not available. You can still access your photo albums, calendars, and notes over the Internet or on your phone using other programs. You will not be able to view the chat log, as well as send and receive new messages. If important information is stored in conversations in your rooms, copy it to another device before updating the phone to the Technical Preview. Additional information can be found in the Rooms section: questions and answers.
• Some text fragments in the preliminary version are not translated into all available languages ​​and are displayed in English. They will be available in all languages ​​after the release of the final product.
• In the preliminary version of the program Windows Phone there is no support function for two SIM-cards, as well as a spam filter.