This app simply displays call history.You can do next things from call history screen. 1 - Re-dial from incoming or outgoing call log. 2 - Sending SMS mail. 3 - Sending Email. 4 - Deleting the call log.Call history app will start from shortcut on your home screen.Also you can make widget to start this app.This widget displays recently call log, and when touching the icon on the widget, you can re-dial only one click .