Currently Being ModeratedRe: How can i add my contacts to a iphone3 when i backed up my contacts when i was using the iphone 5?Feb 5, 2013 3:50 AM (in response to rp91hawk)
If the iPhones have been used as designed, contact are synced to a supported application on the computer or a cloud service. Simply sync them back.
On the other hand, if you have merely been syncing and backing up the device and contacts are stored in the backup, you are out of luck. It is not possible to restore a backup from an iPhone 5 to an iPhone 3G. More specifically, the only way to restore a backup is if the device being restored to is running the same or higher version of iOS than the device the backup was created on.