Chapter 10. Resetting and Troubleshooting
If your iPhone starts acting like a bad PC and seems to be hopelessly fouled up, you may need to reset it to its original factory settings. This will wipe out any private information you've stored on your iPhone, but it will also wipe out any potential conflicts that may be causing your iPhone to crash, freeze, or behave erratically. Sometimes you can fix an erratic iPhone by updating its firmware (see Project 8). Firmware is the program that makes your iPhone actually work. It performs functions such as displaying icons on the screen. Apple constantly updates the iPhone's firmware to fix problems iPhone users may be experiencing.
You can reset your iPhone in several ways, ranging from the mild to the drastic. ...
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