Contact Folder on Caldav Server Does Not Sync to iPhone

Should a Contact Folder on eM Client sync to an iPhone or do I need to set my groups up as distribution lists instead? I’m using the caldav server on a Mac OS X 10.8.5 server.

Hi, are you receiving any errors from the application? What version of eM Client are you currently using?
Can you try right click the contacts folder and select Properties > Repair and hit the repair button?

Let me know if it solved the issue,
thank you,