Samsung Galaxy J3 V / Galaxy J3 (3rd Gen.) - Edit a Contact
Users are no longer able to set individual message notification tones for contacts on devices running Android® 8.x (Oreo, O).
From a Home screen, swipe up or down from the center of the display to access the apps screen. These instructions only apply to Standard mode and the default Home screen layout.
Tap Contacts.
Select a contact.
Tap Details.
Tap EDIT (upper-right).
Edit any of following then tap SAVE: Depending upon the account (e.g. Phone, Google, etc.), the options presented may vary.
Name
Organization
Phone To add a pause (a 2-second delay between numbers) or wait, tap *+# then tap Pause or Wait.