First, make sure you're using the latest version of iOS. If you still have an issue after you update, find your symptom below and follow the link for help.
Acoustic-speaker/microphone/receiver
Get help with these issues:
Power/Battery
Battery or charging issues
Acceptable temperatures
Other issues
Get help with your iPhone if it has any of these issues:
- Won't turn on
- Appears frozen
- Doesn't start past the Apple logo
- Won't slide to unlock or slide to power off
Screen
Get help with the screen on your device if it has any of these issues:
- The screen is too dim, too bright, or you see only faint images
- You see a solid color screen (black, white or blue)
- You see lines, missing sections, discoloration, or poor image quality
Get help with other screen issues:
General device and connectivity
Wi-Fi and Bluetooth issues
See these articles for help with Wi-Fi issues:
The "No Service" message appears in the upper left corner of the display
Get help with this issue.
"No SIM installed" alert
Get help with this issue.
Not seen in iTunes / USB connection issues
See these articles for help with this issue:
Buttons and switches
Get help with the Sleep/Wake button, Home button, volume buttons, Ring/Silent switch, or Side Switch.
Camera
Accessories
Get help if you accessory isn't working:
Issue not solved
If you still have an issue with your device, contact Apple Support.