vCard Wizard Contacts Converter Pro Edition is the easiest way to import vcf (vCard) files to iPhone.
Just follow these simple steps:
            
                -  Launch the Settings app on your iPhone, tap on iCloud, Sign in and turn on Contacts in the list of iCloud services; 
 
                -  Download, install and launch vCard Wizard Contacts Converter on your PC;
 
                -  Select vCard (vcf) file or several files as contacts source;
 
                -  Select iCloud as your destination source and click Next;
 
                -  Choose the contacts you want to import to iPhone, confirm your selection and click Transfer;
 
            
            In just a few seconds, the contacts you have imported from vcf files will appear in your iCloud contacts and connected iPhone devices.