Host interface for SIM card

Hi all,

I am studying GSM SIM card.

SIM has five pins: Vcc, GND, Rst, I/O and Clk.
I want to know host status of these ports before host and SIM are
connected together.
In the ISO 7816 spec. I/O is high before communicating each other, so
it seems that there is pull-up in host side, but I can't find the
similar description for other ports in ISO 7816.

Thanks in advance.

JC