Change default setting when phone is first turned on

When you first turn the screen on the phone keypad comes up I want the home screen to be the default how do I change that?

Hi, so just to clarify; you turn the phone on, let it boot up, then the first thing you see is the keypad? is there anything else behind it? does it open within an app? could it be that you have a security password / pin set up on the lockscreen and the keypad is loading up for you to input the password?

More info is needed....