This is how i use mobile internet on my laptop may be its helpful for u
SETTINGS FOR ZONG INTERNET
Attach the mobile using a Data Cable and install Modem Driver (for most of nokia mobiles it will be installed automatically
otherwise use the CD that come with your mobile phone to install the driver)
Then go to Start---->Control Panel---->Phone and Modem Options---->Modems
Select your mobile phone modem and click
properties---->Modem and select max port speed to 115200
Go to Advanced and give the string in Extra Initialization Commands as
AT+CGDCONT=1,"IP","zonginternet"
Press OK
Go to Network Connections and create a new connection manually by usinng wizard
Give ISP Name as ZONG
Give Phone no *99***1#
Leave username and password fields blank
Finish the wizard and dial the connection to connect to internet