How NFC Business Cards Actually Work

The card has no power of its own

Inside the card is a small antenna and a chip, and neither of them is powered. When a phone comes within an inch or two, the phone emits a radio field, and that field induces just enough current in the card's antenna to wake the chip up. The chip spends that borrowed power doing one thing: handing back a short piece of text, which is almost always a web address.

This is why the cards have no battery to replace and nothing to charge. It is also why they last. There are no moving parts and no components that wear out with repeated use, so a card fails only if it is physically damaged, snapped, soaked, or put through something it should not have been.

The phone does the rest

Once the phone has the address, it behaves the way it would if you had typed that address yourself. A notification appears, the customer taps it, and their normal browser opens the page. Nothing is installed and nothing is stored on the card beyond that one link.

That last point is worth sitting with, because it is the most common misunderstanding. The card does not hold your menu, your review page, or your Instagram profile. It holds the address of those things. The content lives on the internet exactly where it already lived.

Which phones can read one

iPhone XR and newer read cards automatically whenever the screen is on. The customer does not need to unlock the phone, open anything, or know what NFC is. They hold it near the card and a notification appears.

Virtually all Android phones from recent years behave the same way. Older iPhones, roughly the 7 through the XS, have the hardware but do not scan for cards in the background, so those customers need to open the NFC reader from Control Center first.

In practice this means the large majority of customers who walk into your business can use the card without being told how. The ones who cannot are usually carrying a phone old enough that they are used to things not working.

What still needs an internet connection

The card itself needs nothing. The phone needs a connection, for the same reason any web page does: the address has to resolve to something. A customer with no signal and no Wi-Fi will get the notification and then a page that will not load.

This matters if your business sits somewhere with genuinely bad reception, a basement bar or a building with thick walls. It is worth testing in the actual room rather than assuming, because it is the one failure mode that has nothing to do with the card.

You can change where it points later

Because the card stores an address rather than content, you usually do not need a new card when something changes. If you control the destination, update what lives there and every card you have ever handed out now points at the new thing.

This is the argument for pointing cards at a page you own rather than at a platform you do not. A card aimed at your own menu page keeps working when you change how you publish the menu. A card aimed directly at a specific third party link stops being useful the day that link does.

If the chip itself has to be rewritten, that is a reprogramming job rather than a reprint, and it is worth asking about before assuming you need to start over.

Where the card physically goes

Counter cards have an adhesive back. Peel the liner, press it onto a counter, a table, a window, or a menu stand, and it stays put. No holder is needed, and a card can be lifted and moved if you rearrange.

The exception is a personal NFC business card, which has no adhesive because it is meant to live in a wallet and be handed to someone. Those are the ones printed with a name and a logo.

Placement does more work than people expect. A review card at the till, where someone is already standing still and waiting for a receipt, gets used. The same card by the door, where people are leaving, does not.