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What is NFC and how does it work? Everything you need to know

NFC has evolved from a quality-of-life feature to something many of us rely on everyday. But how does it work?


what is NFC on a phone?

You’ve probably heard of it before and may even own a smartphone that features that technology, but what is NFC on a phone anyhow? Most smartphones these days are equipped with Near Field Communication technology, better known as NFC. In a nutshell, it is a proximity-based wireless communication standard. Unlike Wi-Fi or Bluetooth, however, NFC interaction is limited to an extremely short range. Besides smartphones, you can sometimes find NFC on tablets, speakers, collectibles, and even gaming consoles like the Nintendo Switch and 3DS.

Even though NFC may seem a bit lackluster on paper, given its short range, it is still a pretty convenient feature that many of us take for granted every day. So in this article, let’s take a quick look at what NFC is and how it works. We’ll also explore where you’re most likely to encounter the technology in the real world.


What is NFC and how does NFC work?

We gave you a brief answer to what it is already, but how does NFC work? NFC isn’t some radically new technology. It’s simply an evolution of RFID (radio frequency identification) technology that has already been around for decades. If you’ve ever used a key card to access an office building or hotel room, you’re already familiar with how it works.

Both RFID and NFC operate on the principle of inductive coupling, at least for short-range implementations. This essentially involves the reader device generating a magnetic field by passing an electric current through a coil. When a tag (with its own coil) is brought nearby, the field induces an electric current within the tag — sans any wires or even physical contact. Then, once the initial handshake is complete, any stored data on the tag is wirelessly transmitted to the reader.


Which devices have NFC?

NFC has been a staple feature on smartphones for several years at this point. The Nexus S was the first Android device to include it all the way back in 2010. Apple also eventually embraced the technology in 2014 — NFC is present on every iPhone since the 6. Similarly, wearable devices, ranging from fitness trackers like the Mi Band to smartwatches like the Apple Watch, also include it.

These days, only lower-end devices tend to not come with NFC. That said, the importance of NFC may vary depending on the region.

What can you do with NFC?

NFC adoption has improved significantly in recent years. Here are a few popular use-cases of the technology:

  • Data transfer: With the release of Android Ice Cream Sandwich in 2011, Google introduced Android Beam. The feature allowed you to transfer whatever content or data you had on-screen to other NFC-enabled devices. All you had to do was touch the back of both devices and accept the transfer prompt. Android Beam was only recently shelved in favor of Nearby Share, which uses Bluetooth and Wi-Fi Direct technologies instead.
  • Mobile payments: Samsung Pay, Google Pay, and Apple Pay all use your smartphone’s NFC chip for contactless payments. Most debit and credit cards these days already have an NFC tag built-in. The aforementioned apps simply emulate these tags, with permission from the issuing bank or financial institution. Once configured, all you have to do is bring your smartphone or wearable device close to the card reader.
  • Quick pairing: NFC’s convenience extends to devices that don’t have a screen. Many wireless speakers and headphones use it to exchange pairing information with your smartphone. Some cameras also use it to quickly initiate a Wi-Fi Direct connection for easy photo and video transfer.
  • Public transport access: Public transport in many cities, including Hong Kong, Singapore, and London, use NFC-based cards as a form of access control mechanism for public transit. Some systems are even compatible with payment apps like Google Pay so you don’t have to carry the card around.
  • Gaming: Nintendo uses the technology to connect physical toys with video games. An Amiibo is like any other action figure or trading card, except that it also contains an embedded NFC chip. If you bring one of them near a Nintendo Switch or 3DS, it automatically grants you additional characters, levels, or bonus items for a particular game.
  • Home automation: A few smart home platforms, including Home Assistant and Apple’s HomeKit, support NFC as well. Using apps on both Android and iOS, you can configure off-the-shelf NFC tags to control devices or automation.