How Install Windows10 Technical Preview for Phones

To installing the Windows10 Technical preview you must have to register Windows Insider program.  
You only want to install this preview for
To try out the software that is still in development and share feedback
To get frequent updates and UI changes
To feel troubleshooting problems

Keep in mind
Unexpected crashes may happen, that will damage or delete your files.
Backup your data's before installing the preview
Installed or future installing apps might not work
Hardware components like bluetooth might not work

Missing features

Its does have Dual SIM support and spam filter
Room features still not available,
Cortana only available in English US language
Messaging is currently missing

Supported phones
Lumia 630, 635, 636, 638, 730 and 830
 
Steps to install the preview

• Join  Windows inside program
• Install the Windows insider app, that is available on windows store or you will get the link after registering.

• After opening the app, select 'Get preview builds'
• Select any options you want to install the preview: Insider Slow and Insider Fast will be given .(better to go second one)
• Auto restart will done.
• After restart goto settings->phone updates->check for updates(make sure now you are in latest denim update) or else it will install only after denim update.
• Keep patience and update, because it take lot time.

Any troubleshoots or doubts about installing or other keep comment buddy will get in touch with you soon.

Microsoft Rollout Windows 10 Techical Preview for Windowsphone

On 12th February Microsoft roll out technical preview for windows phone. To getting this preview, need to register "windows insider". 

They proving two releases of the techical preview. One is 'Insider slow' and other is 'Insider fast'. Insider one having low issues and slower to getting updates and all while insider fast can get faster update of the upcoming releases in the preview and it having lot issues too.

The preview is only for selected phones which are comes with windows 8.1 when you buy. Microsoft allowed only now:
1. Lumia 630

2.Lumia 635

3.Lumia 636

4.Lumia 638

5.Lumia 730

6.Lumia 830

Other phones will get sooner. The preview is not yet in China.
Whats new in this:

This preview comes with  quick actions center and interactive notification. And we can change the background color into images, increased the customization of start menu tile icons. They changed setting menu UI, pictures menu UI, number pad changed and added advanced file manger app, sound recorder app etc. They gives advanced alarm functions and calculator. Makes Cortana better and available to more countries. windows camera UI changed into like lumia camera app UI. Added more languages and updated the keyboard. In the actions center, added expand or collapse options and more options to add icons. And added one more player as default player to play videos and pictures.