Apple does not allow removing contact groups from the iPhone�s native Contacts app. Here is a way to go around this limitation and delete your iPhone contact groups.
What you need in order to delete contact groups from your iPhone:
- A tiny utility you can download from here:
http://www.copytrans.net/copytranscontacts.php - A Windows PC
- Your iPhone
1. Run the utility above from your computer and plug-in your iPhone. You can see that your iPhone contacts and contact groups will begin populating the program window
2. Select the iPhone contact group you�d like to delete and right-click on it. Choose �Delete Group�
3. Your iPhone contact group is now deleted. The contacts which populated the deleted group remain on your iPhone
Good to know a quick method to delete contact groups on iPhone.