The modern smartphone has long since ceased to be just a device for calling, becoming a universal tool for interacting with the world around you. One of the key technologies that ensure this connection is NFC (Near Field Communication). Owners of Xiaomi devices often wonder about the functionality of this component, its configuration and how to use it in everyday life. Understanding the principles of the NFC module will allow you to maximize the use of the capabilities of your gadget.
The technology allows contactless data transmission over very short distances, usually not more than a few centimeters, which provides a high level of security when making payments or transmitting sensitive information. In the Xiaomi ecosystem, the implementation of this feature has its own features, depending on the device model and the regional version of the firmware.
The principle of operation and the device of NFC in smartphones
The technology is based on electromagnetic induction. The NFC module is a miniature antenna and chip that can operate in active and passive modes. When you bring your phone to a payment terminal or tag, the magnetic field of the reader induces current in the smartphone antenna, activating the chip. This process occurs instantly and does not require pairing devices, unlike Bluetooth.
In Xiaomi smartphones, the antenna is most often located at the top of the case, next to the main camera or camera block, which is why it is necessary to bring the upper edge of the device to the terminal to successfully pay or read cards.
⚠️ Warning: Metal phone cases or thick cases with metal inserts can shield the signal while doing the job NFC In such cases, the module may not read the map even when it is in close contact.
There are three main modes of operation that the NFC controller supports: card emulation, tag reading, and peer-to-peer (file transfer) mode. Xiaomi smartphones most in demand card emulation mode, which allows you to use the phone as a bank card or a pass. Peer-to-peer mode, known as Android Beam, in modern versions of Android, is gradually replaced by faster transfer protocols such as Quick Share.
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Use thin silicone or plastic cases for better NFC performance. If you notice the terminal stopped reading your phone, try removing the case and try again.
How to check for and enable NFC on Xiaomi
Not all budget models have a short-range module, so the first step should always be to check the hardware of the device. The easiest way is to look at the system settings. Go to the Settings menu → Connection and Sharing (or Additional Features in older versions of MIUI). If there is an NFC switch, then the part is available.
Also, the presence of technology is often indicated by the logo on the back of the device or in the specifications on the box. In the global versions of MIUI and HyperOS firmware, the function is put in the notification curtain. Pull the curtain down and find the NFC icon. If there is no icon, add it through the quick settings editing menu (pencil button or tripod).
- 📱 Go to Settings and use the search by word"NFC".
- 🔍 Check the specifications of your model on the official website of the manufacturer.
- 📡 Note the presence of the “N” icon on the back of the smartphone.
- ⚙️ Try to turn on the function through the fast action curtain.
If you haven't found the right settings after all the checks, it's likely that your model doesn't have the right module physically, and manufacturers often remove NFC from the cheapest Redmi or POCO models to reduce cost, and then software inclusion is impossible, because there's no chip or antenna inside the device.
Google Pay and Contactless Payments
Main use case scenario NFC In Russia and the CIS, the technology is currently being hampered by restrictions on payment systems, but it continues to work for transportation and other services, and Google Pay (now Google Wallet) has historically been used to set up payments. For its operation, it is necessary that in the system of settings → Passwords and security → Data access was not restricted to Google apps.
The most important condition is the presence of a security certificate Google Play Protect and the absence of root rights. If the phone is unlocked, the payment system can block the addition of cards. In the NFC settings, the HCE Wallet security element or the operator's SIM card must be selected if the payment service from the mobile operator is used.
| Parameter | Status for payment | Where to find out |
|---|---|---|
| NFC module module | Included | Curtain/Settings |
| Screen locking | Password/Printprint | Passwords and security |
| Root rights | Absent. | Root Checker applications |
| Google services | Active. | Account settings |
⚠️ Note: when adding a card, the bank may request confirmation through SMS Make sure you have access to the phone number linked to the card.
For payment in the subway or buses, virtual maps of transport systems are often used, which can be added to Google Wallet or specialized applications, such as Mir Pay (where it is supported) or applications of banks that store cards in the memory of the phone. The addition process is standard: click Add card, enter data or scan the card with the camera, confirm the release.
☑️ Checking readiness for payment
Using NFC for Smart Home and Automation
In addition to payments, NFC tags offer tremendous opportunities for automating scripts in the smart home. Xiaomi’s MIUI-enabled smartphones allow you to create your own shortcuts. You can buy a set of programmable tags and paste them in the right places: at the entrance, on the bedside table, in the car.
When you hold your phone to that tag, you start a pre-programmed action, which could be setting the alarm, setting the navigator, switching Wi-Fi, or controlling the devices in the Mijia ecosystem, for example, a tag by the bed can turn off the lights in the smart lamp and put the phone in Do Not Disturb mode.
Label programming uses a standard app or third-party utilities like NFC Tools. Write down a command and the phone will respond to it instantly, which is especially convenient for guests: they can connect to your Wi-Fi by simply holding the phone to a tag on the table, without entering a password.
The Secrets of Automation
Diagnostics and solution of problems with the module
Sometimes users are faced with a situation where NFC stops working suddenly, the first thing you need to do is to program reset the module. Go to the settings, turn off the function, restart the device and turn it on again, often this solves the problem of the got stuck driver.
If your phone stops seeing cards or terminals, check the list of apps with access to NFC. From the Settings menu → Connection and Sharing → NFC → Security element, try changing the default app. It’s also worth clearing the cache of the Android Pay or Google Pay system service through the application management menu.
- 🔄 Reboot your smartphone to reset temporary system errors.
- 📶 Make sure the flight mode is off and the network is stable.
- 🧹 Clean the back cover of the phone from dirt and dust.
- 🛡️ Check if the antivirus is blocking access to the module.
In rare cases, the problem lies in the hardware: the antenna inside the case is unstuck or the chip fails after falling or getting moisture. If the software methods do not help, and the phone is under warranty, it is advisable to contact an authorized Xiaomi service center for diagnosis.
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Most NFC problems are solved by simply restarting the device or reconfiguring the security element in the NFC menu.