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iPhones don’t :(

I have used this many times without a problem.

iPhones share with contacts if you bring phones close to one another. No need for QR code.

What if the guest has an Android phone?

As an iPhone owner, I just don’t allow Android people into my home.

Where will the blue bubblism end?

We ask them politely yet firmly to leave[1]

Android's share does both. Enables NFC sharing and shows a QR code. Don't worry, I'm sure iPhone will catch up in a few years. :-)