I was trying to learn about UICC (Universal Integrated Circuit Card).
I read this article: 
<http://www.justaskgemalto.com/en/communicating/tips/what-uicc-and-how-it-different-sim-card>

I don't really understand this phrase: "*Like the SIM, the UICC has an application that stores your contacts and another that...*"
The application stored on the UICC runs on the phone OS? Or the UICC has an operating system ?!??

Another phrase: "*Smaller in size than a full card, it contains a computer, or microprocessor, its own data storage and software.*"

How can it contain a microprocessor?