Is it applicable to be able to add customized app to Phone HD an app build in house or this is not applicable could we customize the GUI ?
You will be able to further customize the UI of the app in the next few months. This will enable additional background and layout options for the various control buttons from which you can choose to customize the experience on each device (from the cloud Admin console for Icon series systems registered to the service.) There isn't an ability to load another application onto the phone display or a plan to enable customization of the UI beyond what I specified here.
The supported customization of the Phone HD GUI is described here: NOW AVAILABLE: Customize Your Phone HD Home Screen .
If there is something other than this you are attempting, you'll probably want to open up a feature request using the Idea content type. These 2 documents go over the feature request process: How to Create an Idea or Feature Request and How Do Ideas and Feature Requests Work.
Retrieving data ...