How to install .xap PhoneGap build in Windows Phone Device?

 As the first step you have to register as a windows phone developer (https://dev.windowsphone.com/en-us/join).

Connect your phone to the computer. Then you have to unlock your device by following the process on Windows Phone Developer Registration.

Go to -----

 C:\Program Files (x86)\Microsoft SDKs\Windows Phone \v8.0\Tools\XAP   Deployment\XapDeploy.exe

This program has the ability of detecting .xap files. Now set the target as ‘Device’

 

Then deploy your app.xap :)