Get a Fresh Start with Your Information
If you want to wipe the Contacts, Calendars, Bookmarks, Notes, or Mail Accounts settings from your iPhone and replace them with what’s currently on your computer, you can do this in iTunes. After you connect your iPhone to your computer, click on the Info preferences tab after you click on your iPhone in the Devices list. In the Advanced section, there is a checkbox for each of the items just mentioned that you can turn on to have iTunes overwrite what’s currently on the iPhone with what’s on your computer. This will be a one-time thing and your iPhone will sync normally the next time you connect it.
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