Pressing home deletes content of dialpad

I have an application which opens a dialpad. When i press the home button to minimise the application and restore the application again the con开发者_开发知识库tents of UI which i had enetered in a dialpad are not there. What might the problem?

It all depends on how the dialpad itself has been coded. Some dialpads actually saves the number when the application goes to "sleep". As I have tested quite a few devices I can not say specific dialers but I do know there are some that saves the state.