How to delete Contact in Samsung Galaxy On7(SM-G600FY)?
You can Delete contacts directly from your Android device using the Contacts or People app. You can also unsync an account to remove all of the contacts that were synced from it. If you store your contacts with your Google account, you can use the Google Contacts website to manage and delete contacts as well.
Navigate to Contacts → MORE → Delete → Select contact → DELETE
Pictorial representation of the above settings are as follows:
a). Tap on Contacts icon from the Home screen.
b). Tap on More.
c). Tap on Delete.
d). Select the Contact you want to delete by marking the checkbox.
e). Tap on Delete.
f). Tap on Delete.
Selected contact will be deleted.
CLICK HERE to know how to add Contact in block list in Samsung Galaxy On7 ( SM-G600FY).