This ring has a changeable 4 Byte NUID
Correct, and if you want to store a URL, then this is the one you want.
BOTH rings have an LF T5577 .
Regarding your iPhone “issue”
Apple don’t think the people who lease own their iPhone handsets can be trusted to manage the security risks of allowing access to your contacts, so you can’t share a VCard.
Luckily for you there is a workaround.
Check out these as see if one suits you
As the creator of one such site dropped into an old thread today, and some sites seem to be no more I thought it might be useful to list some of the sites we know about.
There is nothing to say that you can’t just save the information anywhere and provide a URL in NDEF on your chip. In fact most of these look like that is what they do. I have no experience of any of these, but these are the ones that I could find that are currently active. This has been arranged in alphabetical order of doma…