We have earlier posted an official list of devices mentioned as first to receive Windows 10 Mobile when available. The official page for US market reveals,
The following Lumia smartphones will receive a free upgrade when available: Lumia 430, Lumia 435, Lumia 532, Lumia 535, Lumia 540, Lumia 640, Lumia 640 XL,
So, what all can you do to get the date for "Windows 10 for Phones" preview release?? Simple, just solve a puzzle. Microsoft's Gabe Aul has thrown the hint in form of a puzzle. while Gabe unleashed the puzzle in reply to a user asking about the date for next
Window 10 for Phones first preview will not come to all the devices is now well-known, though more devices will get added as the preview progresses to newer builds. It is also good to finally get reconfirmed that all the Windows Phone 8 devices will ultimately receive Windows 10.
Some more tidbits about Windows 10 for Phones via Gabriel Aul from Microsoft!!
Good news, Lumia Denim is not required for being able to upgrade to Windows 10 for Phones preview build.
@ReinerVergara No, Denim is not a requirement to upgrade
— Gabriel Aul (@GabeAul) February 10, 2015
Lumia 635 (Lumia 630 too) seems
Gabriel Aul from Microsoft has now confirmed that not all Windows Phone 8 devices will get the first Windows 10 for Phone build. But good news is that the list has certain 512 MB RAM devices on it too and is it hard to guess which devices will make it