Answer to: Why are my contacts not syncing correctly between iPhones and iMac?There is a way to transfer contacts from iPhone to Mac via iCloud. you can follow it. 1.Sign in with your iCloud account and click "Contacts" 2.From the list, select the contacts that you wish to export 3.Click the icon depicting a cog wheel, and select "Export vCard" Wait for the file to be downloaded on your Mac supposing that the method does not work, seek help for iPhone Transfer.
Answer to: How do I put my iPhone 3G in DFU Mode?I can't see the purpose of putting iOS 7 to DFU mode at the moment. However the instructions are following: 1) Power the device down 2) Start holding Power button for 3 seconds 3) Hold Home button but don't let go of the Power button, 10 seconds 4) Keep holding Home and let go of Power. About 15 seconds just to be sure That's it. You should now be in DFU mode. read more: How to put iPhone in DFU mode?
Answer to: Data transfer from iPhone to iPhoneExcept iTunes, iCloud is also a convenient tool for iPhone users which can achieve the transfer without pc to do the phone transfer. 1.Launch the Settings app on old iPhone and navigate to iCloud > Storage & Backup and tap on Back Up now button. This may take time depending on the amount of data to be backed up. 2.After the backup is complete, check the Last Backup time (should show current time) to ensure that your backup was successful. 3.Now turn off your old iPhone and turn on your new iPhone. 4.When prompted to set up, choose “Restore from iCloud Backup,” tap next, and enter your Apple ID and password. READ MORE: how to transfer contacts from iPhone to iPhone?