Q:

iPhone icon - Red # indicators

How do you implement the red number indicators (like the email count notification)?

A:

What you are looking for is the applicationIconBadgeNumber property which is a property of UIApplication.
To set the badge, from anywhere in your app, use:
UIApplication *application = [UIApplication sharedApplication];
application.applicationIconBadgeNumber = 1; // set to any integer

To remove the badge, set the property to 0.
Documentation on Apple Developer Website

