I was able to use GPRS but net connection expired shortly.

I setup through Kppp manually. Following are details.
Phone no. *99***2#
Authentication PAP
Modem Name HTC
InIt script AT+CGDCONT=1,"IP","airtelgprs.com","",0,0 (This script was provided by my service provider)
I have connected my Laptop(hp pavillion) via bluetooth with sonyericsson T610.
In the username I put mobile number in the password put password as suggested by my service provider. On clicking connect internet connection done but after few seconds it expired with this message. Exit status 15.
this has happened many times. i want a stable connection. Please help me.
Manpreet

Same problem.
After a connection is established i can surf the internet, but the connection is lost very often.
in logs "pppd send break to the modem" or sth like that
i tried also connect via bluetooth with nokia 6230 - exactly the same problem.

p.s. The signal is very good, on windows machine its works excellent