Have you tried any troubleshooting?
- Restart: Press On/Off button until the Slide to Power Off slider appears, select Slide to Power Off and, after It shuts down, press the On/Off button until the Apple logo appears.
- Reset: Press the Home and On/Off buttons at the same time and hold them until the Apple logo appears (about 10-15 seconds).
- Restore: Connect your iPhone to iTunes on your computer, backup, and then select Restore to Factory.
The local Apple store should be able to help you at no charge since it's still in warranty. You also get 90 days from date of purchase free telephone support.
Contacting Apple Customer and Support Service
- Apple Store Customer Service at 1-800-676-2775 or visit online Help for more information.
- To contact product and tech support: Contacting Apple for support and service including international calling numbers.