This article demonstrates how to delete a contact group from your iPhone. Note that deleting iPhone contact groups will not delete the contacts which exist within the groups, but will only remove the iPhone contact group from your device.
Deleting contact groups directly from within your iPhone is a feature which Apple has unfortunately not made available. This is where CopyTrans Contacts comes to the rescue. The program makes the process of removing iPhone contact groups quick and easy. The program also helps you delete contact groups from your iPad or iPod Touch.
Download CopyTrans Contacts from the following page:
Delete iPhone contact group
Install the program. If you need help installing CopyTrans Contacts, please refer to this article
Run CopyTrans Contacts and connect your iPhone to your PC. Let your iPhone data load in the program’s main window
Select the iPhone contact group you wish to delete and click the red “X” button on top of the “Groups” pane
The selected contact group is now deleted from your iPhone. Note that the contacts which the deleted group contained remain on your iPhone
This is a very easy way to delete contact groups on your iPhone.