How to find and change the APN settings on my Samsung Galaxy S Vibrant

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Some third-party applications might require a direct TCP or HTTP connection to the Internet. For example, a stock price application might require a connection to the Internet to retrieve the latest stock prices. The TCP settings might be required for the third-party application to access the Internet.
The correct settings can be obtained by contacting your service provider.
1. Touch Menu.
2. Touch Settings.
3. Touch Wireless & networks.
4. Touch Mobile networks.
5. Touch Access Point Names.
6. Touch the required APN.
7. The APN settings will be displayed.