@ puneet28 first of all you have to install
Nokia pc suite. you have to see in my computer properties, go to hardware then device manager , then in modems expand +, there you will see your nokia usb modem. secondly go to start , then control panel then click phone and modem options, then click modems, there you will see your nokia usb modem com port , after selecting its properties, select advanced tab, there give extra initialisation command " AT+CGDCONT=1,"IP","
TATA.DOCOMO.INTERNET . Thirdly you have to create a dial up connection by following this procedure : click start, then all programs, accessories, then network setup wizard and follow the instructions, in place of phone no. enter *99***1#. this procedure is for
WIndows XP3. hope it may help and give your feedback. regards lubob