Remember the time in November last year, Microsoft has said all devices running Windows Phone 8 will be officially upgraded to Windows 10 Mobile. However, according to information from the site Neowin, Windows 10 Mobile can only be run on a certain number Lumia line.

Specifically, Microsoft announced on its homepage:
These devices are in the following list will be upgraded to Windows 10 Mobile for free, including: Lumia 430, Lumia 435, Lumia 532, Lumia 535, Lumia 540, Lumia 640, Lumia 640 XL, Lumia 735, Lumia 830, and the premium Lumia 930. smartphone 

Based on this information, there are two cases will occur, or 10 smartphone Lumia list will be updated as soon as Windows 10 Mobile was released, the remaining equipment will be updated later. Or only some smartphone will be allowed to  upgrade the new operating system by Microsoft.

Notably in this list, Microsoft also did not mention 3 most popular 512 MB RAM smartphones Lumia 520 and Lumia 630/635. This raises the question, if the Redmond software turned against this low-range devices, whether anyone will experience Windows Mobile.

Therefore, firstly upgrade some smartphones, then update to the entire Lumia devices sounds more reasonable. By last year, it Microsoft also applied this method with Windows Phone 8.1.

Also, in the Windows 10 Mobile announcement, Microsoft also uses the Lumia 1520 the phablet as a prototype to run Windows 10. Therefore, the possibility of Windows 10 Mobile will be available to the “every country” is totally reasonable.
Also related to Windows 10 Mobile, Neowin site also suggest this platform will be announced in November this year. By following the claims of Microsoft’s senior leadership is Anthony Doherty, the company will soon deploy Windows 10 Mobile in South Africa later this year as early as November.

The foundation of Microsoft core error is Windows 10. They are not talking about the device, which is running throughout the ecosystem there. The user experience will be greatly improved. They hope to soon offer Windows 10 Mobile later this year