How to install Windows 10 on mobile smartphone
Shortly before mid-April Microsoft has made available a version of Windows 10 adapted to smartphones. As with the PC version it is a test version still under development. It is therefore imperative, as the final version did not arrive, install it on a phone other than your main unit.
Compatible devices are the Lumia 1020, 1320, 1520, 520, 525, 526, 530, 535, 620, 625, 630, 635, 636, 638, 720, 730, 730, 735, 810, 820, 822, 830, 920, 925, 928 and Microsoft Lumia 430, 435, 532, 640, 535. Before starting the installation you must be registered to the Windows Insider program https://insider.windows.com/
Install and open Windows Insider app: upload insider Windows in the Windows Store
Once the application is launched button "Get Preview builds"
As for the PC version two update speed you are proposed. In "Slow" (slow mode) you receive the most stable updates but less frequently. In "Fast" (quick mode), you will get more updates at the expense of stability. You decide if you want to favor the new test or stability. Once the choice is made, tap the arrow at the bottom of the app.
Windows Phone tells you that this is an experimental and therefore unstable release. This may void the warranty of the mobile and can cause problems for telephone or other communications or even completely prevent using the phone. A restoration program is offered but remember to back up your personal data, including photos, before handling.
The smartphone restarts to finalize the change. On the next start go to Windows Phone settings under "System" and select "Update Phone"
Click on "Check Availability updates:
Once the update detected and downloaded, launch the installation by clicking "Install":
Your smartphone or Lumia Windows Phone will reboot and install Windows 10 Mobile Phone Preview. The operation is quite long, and varies depending on the data to the mobile and the device.
If you have difficulty using post your requests in the forum the Windows Phone forum.