Help on Huawei 220 3.5g wireless modem card

[loody]

Dear all:
I install ubuntu 7.10 and my kernel is 2.6.22.
When I try to use wvdial to connect to Internet, I always get the
error message like "SIM PIM required".
I know there is a pin number I need to key in while each time I use
the card on XP.
But I have no idea where I can key the  pin number in wvdial.conf.
if someone has the same experience before, please let me know.
appreciate your help,
miloody