How to reset the network settings on my Apple iPhone 4

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The Apple iPhone 4 has many reset options. Wiping the network settings will reset all the current network settings to default.
1. Touch Settings.
2. Touch General.
3. Scroll to and touch Reset.
4. Touch Reset Network Settings.
5. Touch Reset Network Settings.
6. The iPhone will reboot. Once it turns on, the default network settings will be restored.