Noticed some interesting behavior related to iPhone contacts. While viewing a particular contact details as initiated from the “Favorites” section, it is not possible to delete the contact. However, while viewing the same contact from the main contact list, it is possible to delete the contact. 

Let’s start with the typical use case. Start with a contact who is on your list of Favorites. Click on the Contacts icon and search for this contact amongst all contacts. Click on the contact to view details. Note the highlighted “Contacts” icon toward the bottom center of the image below:

Click on the edit button in the top right corner to see this: 

If you scroll all the way down, you will see the big red rectangular button to delete the contact:

Let’s now look at this contact’s details from the Favorites view:

Click on the arrow to see details:

Click on edit to see:

Scroll all the way to the bottom and you will NOT see the big red rectangular delete button!!