So whats the catch with this FREE ad-based version? Very little! The applications are ad-enabled, that is, adverts are displayed in exchange for free usage. Unlike traditional ad-enabled applications the adverts do not appear in the games to spoil your enjoyment. Instead, adverts are displayed when you receive incoming phone calls or text messages.You control the category and frequency of adverts you are prepared to view. The more adverts you view, the more credits you accumulate. Accumulating credits means you can access more free applications.