Im AppStore gibt es z.Z. die App „Delete Contacts + Duplicates“ gratis/kostenlos.
This app is the best way to quickly delete multiple contacts of your address book, to symply merge all the duplicate contacts and to easily backup all your contacts!
DELETE MULTIPLE CONTACTS
Delete multiple contacts of your address book at once! Fast and easy!
MERGE DUPLICATE CONTACTS
Merge all the duplicate contacts of your address book with one tap! Very simple!
Backup all the contacts of your address book with one tap! Fast and so useful!
SHARE BACKUP FILES
Share backup files via text message, email, Dropbox, iCloud Drive, .. !
Restore contacts at any time directly from the app! Choose contacts to restore!