After backing up the old Nokia C2-01 phone book into a .vcf file, I needed a way to import the data onto an Android 5.0 phone.
Since I already use ownCloud together with DAVdroid for synchronizing calendars, I tried the ownCloud contacts app.
The contacts app has an import button which opens a window in which I selected "Standard VCard", selected the file and voila - the contacts we in ownCloud. DAVdroid took care of the rest and synchronized the contacts onto the phone.
The stock android contacts app com.android.contacts in Android 6 (Cyanogenmod 13) is actually able to import vCard .vcf files: Contacts -> ⠇ -> Import/Export -> Import from .vcf file.