hi,
That solution doesn't work for my brand new Samsung Xcover 4. I've been able to import my contacts from my old Motorola Defy +, somehow. BUT there is no EDIT ringtones for individual contacts option. When in Contacts app I can see the EDIT button & "3 vertical dots" button at the top right of the screen. There is no MORE button. Clicking on the "3 vertical dots" after choosing a contact to edit gives me "Groups, Delete Share & Settings" options only. I can "edit" the contact via the phone app. BUT this only shows "Name, Phone & Email" details, for each of the contacts phone numbers held on the Sim Card. With no way that I can find to change other details.
Clicking on the 3 vertical dots at the top right of the screen, via the phone app, gives me "Delete, Manage linked contacts, Set as default, Move to Secure Folder, Share & Block contact" options.