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If you have a backup your iPhone, see this document on how to restore it. One of the things that is backed up is your contacts.
Every time you connect your iPhone to your Mac, iTunes automatically creates a backup of certain information from your iPhone and saves in on your Mac. To see what is all included in the backup and where this backup can be found, see this document.
This is the ipod forum. Perhaps you should post in the iphone forum.
You should be syncing your contacts to your computer regularly.
They would be in whatever program you have selected.
Perhaps you should look at the manual:
1.Open iTunes on your computer.
2.Plug in your iPhone to your computer just as you would to sync it normally.
3.Locate the iPhone in the "Devices" column at the left of the iTunes application window.
4.Right-click (Ctrl + click for Mac) on the iPhone icon in the "Devices" column and select "Restore From Backup." Select one of the backup versions from the drop-down menu and click the "Restore" button. This will restore any contacts that you have lost since your last sync in iTunes.
5.Eject your iPhone and go to your contact list on it. Any lost contact or contacts should be restored to your list.
Read more the article about [How to transfer iPhone contacts to computer|http://www.softwarebbs.com/wiki/Howto_transfer_and_backup_contacts_from_iPhone_toPC],hope it can help you much.
hi, I lost all my contacts in my iphone after downloading 2 applications. it was the first time i connected the iphone to the computer and therefore didnt have backups but i'm sure everything is in the phone. I had 1000s if conatcts and need to get them back. Any help or advise is badly needed. PLEASE
Use your Mac Address Book and sync your iPhone with iTunes. From the Info tab, under Contacts, make sure to select “Address Book” from the drop-down menu before you sync.
I am not sure whether it works on Mac, but you can use copytrans contacts to transfer the contacts too (in case you do not want to use iTunes sync):
Finally, you can simply use the iCloud app and install it on your Mac. Make sure to enable iCloud contact sync on your iPhone. Then import contacts from your Mac to your iCloud application, this will move and sync the contact entries to your iPhone.