iPhone won't let me delete a List in my Contacts

I don't use Lists in Contacts but I accidentally created one called "All iPhone" which contains all of my Contacts. Now when I tap Contacts, I get this List heading and have to tap again to get to my Contacts. I don't want this List. How do I delete it?

I've tried going to Edit but the list is greyed out so I can't tap+hold then delete. There are no other options. I want to delete the List (but not the contacts).