Connect to a WiFi wireless network router and browse the web on your iPhone 3G. Here is how:

1. Ensure Wireless is enabled under Settings > Wi-Fi and turn it on.

2. Join a network by selecting Settings > Wi-Fi.

3. Select the network you would like to connect to.

4. You may need to enter a password, then select Join.

Now enjoy the Internet. You will know if the device is connected to a wireless network if the Wi-Fi logo appears on the top bar of the screen.