How do I remove content from my iPhone?
If your iPhone is not working as expected, it may be due to some of the content sync-ed to it. Try removing certain content, such as contacts, calendars, songs, photos, videos, or podcasts. To remove content, connect your iPhone via the USB and use iTunes to change the sync settings. Click on iPhone in the ‘Source’ list and select each tab to change the sync setting, and then click ‘apply’.