Microsoft has released an early version of Windows 10 for smartphones and in case you are interested you can get the software if you participate in the Windows Insider program. All you have to do is register your smartphone and then the device will get the new software over the Internet.
The real purpose of this version of Windows 10 is not to give you bragging rights but to test the viability of the new OS so if you encounter any bugs you will be able to tell about them via Windows Feedback. Your efforts will be awarded – users of this program will get the final version of Windows 10 for free, it appears.
Users of Lumia 630, 635, 636, 638, 730 and 830 will be able to run this early version of Windows 10 and since the first two models have just 512 MB of RAM, this means that the new OS will not be that much hungry for memory. In case you wonder this Windows 10 version will bring you a more powerful Photos app, interactive notifications, more quick actions in Action Center, full-size background image for Start, and a significantly enhanced speech-to-text capability.
Source: Microsoft