So you have a Blackberry Curve 8300 smartphone and a laptop using Windows XP. Follow these simple instructions to connect to the internet using your Blackberry Curve as a modem wherever you get cellular network coverage
1
You must install the Blackberry Desktop Software 4.1 or later. Step2
On your laptop, Click, Start, Settings, Control Panel, Phone and Modem Options. Now click the Modems tab. Click on Standard Modem. Click Properties. Click Change Settings. Click the Advanced Tab. Go to EXTRA INITIALIZATION COMMAND and type +cgdcont=1, "O{", "(your APN)"If you do not know your Internet Access Point Name (APN), contact your mobile service provider.
Step3
Click Start, Settings, Network Connections. Now Double-click on New Connection Wizard. Click Next. Click Connect to the Internet Option, then click next. Click on Set up my connection manually and then click next. Click Connect using a dial-up modem and then click next. When the Select a Device screen appears, then select the Modem - Standard Modem check box. Now click next. In the ISP Name field, type a name for your connection. Now click Next. In the phone number field, type *99 and then click next. Now you will have to indicate which users will have access to the connection and then click next. Type the user name and password provided by your service provider and then click Next and then Click Finish. In the Connect window, click Properties. Where it says Connect Using add Modem - Standard Modem and then click Configure. In the Modem Configuration window, uncheck the Enable hardware flow control check box and verify that none others are checked. Click OK. Click OK again. Step4
Depending on your service provider, you may need to pay for an extra service from your cellular service provider in order to use your phone as a modem. 
