Are you having an application or hardware problems with your iPhone? Check out the following articles to learn how troubleshoot or repair some of issues that you may encounter.
iPhone Troubleshooting Tips
Provides advice on iOS and application troubleshooting
iPhone Recovery Mode (Advanced)
Explains how to restore your phone to its original state or last backup
Hardware: iPhone DIY Part Replacements
Provides advice on how to get an screen (e.g. LCD, glass, or digitizer) or battery replace for your iPhone.