How to find and change the APN settings on my Apple iPhone 4

Click each step to see the action. You can also click the picture or use the arrow keys.

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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 mobile network.
1. Touch Settings.
2. Touch General.
3. Touch Cellular.
4. With mobile data on, scroll to and touch Cellular Data Network.
5. The APN settings are displayed.