How to find and change the APN settings on my BlackBerry Bold 9900 4G

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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. Scroll to and select All.
2. Scroll to and select Options.
3. Scroll to and select Device.
4. Scroll to and select Advanced System Settings.
5. Scroll to and select TCP IP.
6. The APN settings are displayed.
If editing is required, after any changes touch the Menu key.
7. Scroll to and select Save.