What can you do with NFC in the smartphone

It seems that gone are the days when you could see the wide eyes of the seller at the checkout, if you decide to pay for your purchase with the smartphone. The NFC technology over the past few years actively stepped in the mass (his role was played by Apple with its iPhone), but its main advantage was that the function is available not only expensive smartphones, but also devices average price segment. Consider some of them and figure out how this technology works.

NFC — the technology of high frequency wireless communication low (10 cm) range. It works through radio frequency identification (RFID): the radio data from the transponder is read and written. The connection between the devices does not exceed 0.1 seconds. Operating frequency for NFC is 13.56 MHz, the maximum data rate is 400 Kbps.

How does NFC

On the basis of the NFC lies in electromagnetic induction: frequency 13.56 MHz reader transmitter with the antenna constantly emits a signal in the form of a sine wave. The sensor also has an antenna, and when the sensor and the reader are at a distance sufficient for the work of the NFC, the magnetic field generated by alternating current in the coil of the reader. Thereafter, the current is generated in the second coil sensor. This energy is easily enough for the last, so NFC can work with passive devices.

In passive mode, the reader creates an electromagnetic field, the NFC tag modulates it and generates a response. That is, the label does not have to be connected to the power supply or have a built-in battery, so its size can be reduced to a minimum.

In smartphones NFC antenna, as a rule, is fixed under the back cover for a more stable signal. It allows the device to become not only a means of payment and travel ticket, but also with a key or a loyalty card of the store. With available technology including budget smartphones: the NFC chip is, for example, in Motorola G5S, ASUS ZenFone Max M1 Pro and Samsung Galaxy A5.

Why the need for NFC

Currently, there are three main applications of NFC. The first and most common is the emulation of cards for contactless payments. A smartphone with NFC can impersonate a Bank card or travel ticket for the metro. In this case, the card data is not stored in the phone memory and on a special chip, similar to what is used in cards of the EMV standard. It encrypts all the data, controls the authentication process, and triggers the payment transaction. Means of payment can be as iPhone X, and more cheap ASUS Zenfone 5.

A second range of NFC reader mode. In this mode, the smartphone acts as a scanner NFC tags containing various additional information. The last time the NFC tag began to displace barcodes in Western stores. You can find them on food products in supermarkets and by bringing your NFC-enabled device, to find out the expiration date and composition of the goods. NFC-tags are used to display interactive advertising.

The third mode is called NFC peer-to-peer. In this case, two devices communicate with each other to exchange information. Thus it is possible to transfer contacts from one smartphone to another or setup Wi-Fi router to the mobile device.

I am glad that every year the NFC is becoming increasingly common. So, the module have the new HONOR 7C and NUBIA Lite Z17. More and more manufacturers leave their smartphones without NFC. And how do you use NFC in your daily life?

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