Xiaomi’s modern smartphones are no longer just phone and internet devices, becoming universal tools for everyday life. One of the key technologies that ensures this versatility is the acronym NFC, which can be found in the specifications of almost any current mid-range and flagship gadget. Many users see this icon in the notification curtain or in the settings, but not everyone understands the real potential of this short-range wireless communication.
In this article, we will explore what lies behind this term, how to activate the module correctly, and what opportunities it opens for the owner of the device. You will learn how to turn your phone into a bank card, electronic bandwidth system or a tool for fast data transfer without using wires. Understanding the principles of this technology will allow you to use your smartphone at full capacity.
It is worth noting that having a chip in the device is only half the battle, since it requires the right software configuration and support from banking applications or transport cards to work properly. We will look at the nuances of the module in the shell of MIUI and HyperOS, and also touch on security issues that often concern owners. The NFC module in Xiaomi phones consumes minimal amount of power when turned off and does not discharge the battery if it is activated but not used.
Principle of operation and technical features of the module
Near Field Communication, or short-range communication, is based on wireless high-frequency standards, with a 13.56 MHz operating frequency that allows data to be transmitted over very short distances, usually no more than 10 centimeters, a feature that provides a high level of security, since an attacker must be in close proximity to the device to read the data.
In Xiaomi smartphones, the antenna module is most often embedded in the back cover or located next to the main camera unit. That is why successful payment or tag reading requires holding the device to the terminal with the top part. Inside the system, a special controller is responsible for the operation of this component, which can operate in three different modes, switching between them depending on the task.
The main advantage of the technology is that it's connected faster, and unlike Bluetooth, it doesn't require pairing or entering access codes, it's instantaneous as soon as two devices are in range of each other, and it's critical for payment systems, where every second counts in a checkout queue.
- 📡 Emulator mode: the smartphone pretends to be a card or other device, allowing you to make payment or pass through the turnstile.
- 📖 Reader mode: The phone reads information from passive tags, such as smart posters or key fobs.
- 🔄 Regime (P2P): It allows you to exchange data between two active devices, for example, to transfer contacts or photos.
⚠️ Note: When using card emulator mode, make sure that the smartphone screen is unlocked. For security reasons, most banking applications require login confirmation before conducting a transaction.
How to activate NFC on Xiaomi devices
Turning on the module on Xiaomi and Redmi smartphones is usually easy, but the location of the switches may vary depending on the version of the operating system. The standard way involves using a notification curtain. To do this, you need to swipe from top to bottom of the screen twice to reveal the full list of fast buttons, and find the icon with the letters NFC.
If the icon is missing, you can add it through the Quick Settings editing menu or find it in the depth of system settings. The way to setup is to open the Settings app, go to Connect and Sharing (or Additional Features in older versions of MIUI) and select the appropriate item, and there is a switch that activates the module.
In some cases, especially after a firmware update, settings may be reset or moved. If you can't find the right item, search the settings by typing the word "NFC" into the search bar. The system will automatically prompt you to go to the desired menu, and it's also worth checking if the feature is disabled in power saving mode, although this is rare.
Once activated, the status bar may have an icon, but newer versions of Android and HyperOS often hide it to save screen space. The main indicator of operation is vibration or audible signal when you bring your phone to the reader. If there is no reaction, check if the phone is wearing a case with metal elements that can shield the signal.
Configuring contactless payment and working with cards
The most popular feature of the module is contactless payment of purchases. To implement this feature, Google Pay (or its analogues, depending on the region and sanctions) must be installed and configured on the smartphone. The process of adding a card is standardized, but requires careful input and confirmation via SMS from the bank.
To start using the payment, open the Google Wallet app and click the add-on button, the system will suggest scanning the card with the camera or entering the data manually, after which the bank will send a confirmation code, it is important that the phone has updated versions of all applications related to finance.
☑️ Checking readiness for payment
Xiaomi smartphones also have the option of configuring a “default application” to pay, which is true if you have multiple apps using the module installed. Go to Settings → Connection and Sharing → Tap and Pay. Here you can choose the default app, such as Google Pay or Mi Pay (if supported in your area).
| Parameter | Description | Recommendation |
|---|---|---|
| Security | Use of data tokenization | High, no map data transmitted |
| Speed. | Instant connection | Less than 1 second. |
| Compatibility | Work with PayPass/PayWave terminals | Supported almost everywhere |
| Energy | Standby consumption | Minimal, autonomous |
When paying with a phone, the terminal often emits a characteristic sound, and a notification of a successful transaction appears on the smartphone screen, in some cases, it may be necessary to unlock the device with a fingerprint or a person, which is an additional measure of protection against unauthorized debiting of funds.
Using a smartphone as a transport pass
Xiaomi owners can use the phone not only to pay in stores, but also to travel on public transport, a feature that is especially popular in regions where transport cards support the NFC standard.
If you can't directly add a transport card to your phone because of regional restrictions, there's an alternative method: You can use a card reader app to copy the physical card ID to your phone if the terminals in the transport only read the UID (unique ID), but this method doesn't work with all card types because of encryption.
Can I clone the intercom key?
For frequent travelers, the ability to purchase e-tickets directly from the transport operator's app is important, and the ticket is recorded in a secure area of the phone's memory and activated when brought to the turnstile, eliminating the need to carry paper travel cards or plastic cards, which are easy to lose.
Some Xiaomi models have a “discharged battery” feature that allows you to make one payment or pass through the turnstile within a few hours after turning off the phone.
Automation of tasks by means of NFC-marker
In addition to payment, the module in Xiaomi phones is a great tool for automation: special programmable tags can be spread around the house or in the car and set up scenarios for their execution. For example, when you bring the phone to the label on the desktop, the phone can automatically switch to silent mode and start the application for notes.
To record scripts on tags, special applications from the Google Play store, such as NFC Tools or Trigger, are used, and these programs allow you to record various commands on the tag: turn on Wi-Fi, start a navigator, send an SMS or open a specific site. The recording process takes a few seconds and does not require special programming skills.
- 🚗 In the car: tag starts Bluetooth, navigator and turns on music.
- 🏠 Home: Tag turns off mobile data and sets alarm.
- 💤 At night: the label on the nightstand turns on the "Do Not Disturb" mode and reduces brightness.
- 🏋️ In the gym: the tag launches a workout tracker and favorite playlist.
💡
Use the colored ones. NFC-labels of different shapes to visually distinguish their purpose without touching each of them with a phone to check.
Scenarios can be complex and involve chains of action, such as a hallway tag that not only turns on Wi-Fi, but also sends a message to family members that you've come home, making your smartphone a real smart home control center, even if you don't have specialized gadgets.
File transfer and interaction with devices
Although NFC is slow, it is often used to pair devices quickly. Android Beam technology (replaced with Nearby Share using NFC to initiate) allowed contacts, links and small files to be transmitted by simply touching phones. In modern Xiaomi, this feature has evolved, but the principle has remained the same: touch-pass.
In addition to transferring files between phones, the module is used to quickly connect to Bluetooth headsets, speakers and headphones. Just hold the phone to a device that supports the NFC Pairing standard, and the connection will be established automatically, without having to search for the device in the list of available and enter a pin code.
⚠️ Note: When transferring files, make sure that the screens of both devices are on and unlocked. For security reasons, Android blocks data from unknown devices if the phone is in sleep mode.
It is also used to read information from various smart devices, such as some Xiaomi routers that allow you to connect to the Wi-Fi network simply by holding the phone to the router’s housing, washing machines and air conditioners can transmit work statistics or receive new washing programs / modes through this channel.
Frequent problems and ways to solve them
Despite the reliability of the technology, users sometimes face problems in the operation of the module, the most common complaint is that the phone stops seeing cards or payment terminals, the first thing to check is whether the phone has a case with a metal plate or a magnetic holder that blocks the antenna signal.
The second common cause of failures is software errors in the Google Play Services service, which helps to clear the app cache or update it to the latest version through the app store, and it is worth checking whether the NFC function is disabled in power saving settings, where the system can limit the background operation of the module.
💡
If the module stopped responding after the firmware update, try resetting the network settings (Settings → Connection & Sharing → Reset Wi-Fi, mobile networks and Bluetooth), this will not delete personal data, but will return factory communication settings.
In rare cases, you may need to completely reset the settings of the module or even the device. Before contacting the service center, it is recommended to check the operation of the phone with different cards and terminals. If the problem is observed with only one particular terminal, it is most likely a malfunction of the reader, not in your smartphone.