Also known as: NFC
Near-field communication (NFC) is a short-range wireless technology that lets two devices exchange small amounts of data when held within a few centimeters of each other.1
Overview
NFC operates at 13.56 MHz and grew out of RFID. Its very short range is a feature, not a limit: a tap is deliberate and hard to eavesdrop on. A device can act as a reader (scanning a tag or card), a tag (presenting credentials), or in peer-to-peer mode.
An NFC controller in the SoC, wired to a small loop antenna, can even power a passive tag through its magnetic field, so unpowered stickers and cards work with no battery of their own. The mobile OS exposes the controller to apps for payments and pairing, usually behind a secure element that holds payment credentials.
NFC vs other short-range radios
NFC deliberately trades range and speed for intimacy and simplicity:
| Property | NFC | Bluetooth | Wi-Fi |
|---|---|---|---|
| Range | ~4 cm | ~10 m | ~30 m+ |
| Data rate | ~424 kbit/s | 1–3 Mbit/s | 100s Mbit/s |
| Pairing | Instant tap | Discovery/pair | Join network |
| Powers passive device | Yes | No | No |
| Typical use | Pay, ticket, tap-pair | Audio, peripherals | Internet, streaming |
Its slowness barely matters, because NFC carries only tiny payloads — a token, an ID, or a handoff that then continues over a faster radio.
Where it fits
NFC is the technology behind tap-to-pay on a smartphone or smartwatch, transit cards, and instant Bluetooth pairing. It complements an eSIM and the longer-range radios in a device: where the cellular and Wi-Fi radios reach across networks, NFC handles the intimate, intentional “touch here” interactions of everyday mobile use.
Sources
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Near-field communication — Wikipedia, on NFC technology and uses. ↩