To add contacts, you can reference another thread
https://discussions.soti.net/thread/automatically-import-contacts-from-a-vcf-file
Hi Raymond, do you now is it possible to delete exist contacts?
Import with vcf works fine but we had old and double contacts.
best regards
Marco
Add and delete in one sync is the part vcf import does not cover well.
NM Contacts does it with a managed app and a web portal. Remove a contact in the portal and it is removed from every device at that location on the next sync, add one and it appears, no duplicates.