I also wanted to do this, but I discovered last week that iPhone (with the latest software) will let you open the VCF file, but it will NOT let you save it!
This was a disappointment for me, because it means I can’t use a VCF file on my website + my implant as a “business card alternative”.
Android works as expected tho: it lets you open the VCF via URL AND save the data once opened.