Restart
Try restarting iPhone. To turn it off, press and hold the Sleep/Wake button until the red slider appears. Slide your finger across the slider to turn off iPhone. To turn iPhone on, press and hold the Sleep/Wake button until the Apple logo appears.

Does iPhone appear frozen or stuck? Try pressing and holding the Home button for at least 6 seconds to close a frozen application. Then try restarting iPhone following the steps outlined above.
Reset
To reset iPhone, press and hold the Sleep/Wake button and the Home button at the same time for at least 10 seconds. During this time, a red "power off" slider may appear and the screen may go black, but do not release Sleep/Wake and Home buttons until the Apple logo appears.
Remove Content
If iPhone is not working as expected, it may be due to some of the content synced to it. Try selectively removing certain content that may be causing unexpected behavior such as contacts, calendars, songs, photos, videos, or podcasts.
To remove content, connect iPhone via USB and use iTunes to change the sync settings. Click on iPhone in the Source list, and select each tab to change what content is synced then click apply.
Reset Settings

Tap Settings > General > Reset > Reset All Settings
Note: This will reset all settings. No data or media will be deleted.
If that does not resolve your issue, try erasing all content and settings.
Tap Settings > General > Reset > Erase All Contents and Settings
Note: This will delete all media and data. All settings will be reset as well.
Restore
Try restoring iPhone using the latest version of iTunes.
Connect iPhone. When it appears in the Source list, click on Restore in the Summary tab.
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