Sync Contacts with Android CardDAV-Sync
Android does not provide built-in CardDAV support. To connect to CardDAV server from Android, you will need to install the third-party connector for Android called CardDAV-Sync or any other client software that supports CardDAV.
Important! CardDAV-Sync client does not support NTLM authentication. Your server must support Basic or Digest.
After the installation run the CardDAV-Sync and select Add New Account:
Provide CardDAV server URL and credentials:
The CardDAV-Sync application supports address books discovery, so you can provide only the path to your CardDAV server, it will find address books and display them in the next step: