How does the unlimited feature on the Raja Kombo IDD plan work?

Subscribers of Raja Kombo IDD will be granted Unlimited YouTube (for Raja Kombo IDD 10 & Raja Kombo IDD 15) and Unlimited YouTube & Facebook (for Raja Kombo IDD 28). All usage of the apps covered under the Unlimited feature will be from this bucket first at the speed of 1Mbps before the main internet quota is used.