Problem in using S3500 mobile as modem

Hello,
I have got Sumsung S3500 phone with BSNL Connection. I'm able to use net in the mobile using GPRS but when I tried to connect to internet from my Laptop (OS is Windows XP) through PC suite it gives me Msg "OS Error Message. The PPP Link Control protocal was terminated" and i am not able to connect to the internet. Firends help me to resolve this. My email address is selva.sb@gmail.com