Open your Windows ‘Start Menu’ and look for ‘Settings’. Within the Settings find ‘Control Panel’ and from there open the ‘Phone and Modems Option’. Here specify your area code and the telephone numbers required to access the Internet and click ‘OK’. From here, choose the ‘Modems’ tab from the available options, select ‘Standard Modems’ and view the ‘Properties’ tab. Once the Properties window is open, click on the ‘Advanced’ tab and look for the field labeled ‘Extra Initialization Commands’. In this field type: +cgdcont=1,"IP"," Your Internet APN". In case you don’t have your APN; get in touch with your wireless carrier and find it out. Or you can also find your APN by clicking the ‘Options’ icon of your BlackBerry, then clicking ‘Advanced options’ and ‘TCP’. If the APN has been saved in the device, it will be listed here.
Once you have filled the Extra Initialization Commands, click OK. Again click OK, when the Phone and Modems Options tab reappears.