Xiaomi’s modern smartphones and Redmi’s sub-brand have long since ceased to be just call and social media devices, becoming powerful multimedia hubs and digital wallets that are always at hand. One of the key technologies that enable this functionality is the near-term contactless module, better known as NFC. This technology allows you to exchange data over very short distances, making the process of interacting with gadgets fast and secure.
Many users, when they first encounter this module, wonder how to activate it and what the possibilities are. Owners of Redmi Note or Xiaomi Mi devices often do not even realize that their phone can instantly transmit large photos or serve as a travel ticket. It is important to understand that having an NFC module in the phone specification does not always mean that you can pay with cards in your region due to the limitations of payment systems. However, basic data transfer and tag reading functionality work everywhere.
In this article, we will take a look at all aspects of working with this technology, how to properly configure your device, what security nuances exist, and how to use your smartphone as a universal tool for everyday tasks. We will look at electronic keys, file transfers, and other useful use cases that will make your life easier.
What is NFC and why you need it in a smartphone
Near Field Communication is a short-range wireless standard. Unlike Bluetooth, which requires device pairing, NFC is a touch-and-work approach, with a range of only a few centimeters, which provides a high level of security when transmitting sensitive data. In Xiaomi and Redmi smartphones, this module is built into the back panel, usually at the top of the case.
The main advantage of the technology is that it's connected fast, and devices find each other almost instantly, without the need to enter passwords or confirm the pairing of the user. This is critical for payment systems, where the bill is for seconds. In addition, the module consumes minimal amount of power, so that its constant switching on has little to no effect on the autonomy of your smartphone during the day.
NFC is a broad feature in MIUI or HyperOS, and in addition to the obvious payment for purchases in store terminals, the technology allows you to read information from electronic tags, transfer contacts and links, and quickly connect wireless headphones or speakers. In some cases, a smartphone can emulate the operation of transport cards or office passes, if security allows this.
⚠️ Warning: When using your smartphone to pay or transfer data, always make sure the screen is unlocked. For security reasons, most banking applications and payment systems require confirmation of action through a fingerprint scanner or Face. ID before the transaction.
It’s also worth noting the difference between having a module and having it actively supported by manufacturers: If you buy a global version of a smartphone, there are usually no problems with functionality, but when you purchase the Chinese version (CN Version) through marketplaces, it can be difficult to work with some regional services, although the chip itself is physically present in the device.
Verification of module availability and activation of function
Before you start setting up, you need to make sure that your particular Xiaomi or Redmi model has the right module. Not all budget segments are equipped with this component, so checking the specification is a must first step.
The easiest method is visual inspection of the case. Often the NFC logo is applied to the back of a smartphone or to the factory film if the device is new. If there are no externalities, you should consult the software settings. In devices with a MIUI shell, the path to control the module is standardized, but may vary slightly depending on the version of Android.
To activate the function, perform the following actions:
- 📱 Open the Settings menu and go to Connection and Sharing».
- 🔍 Find a point «NFC» and move the switch to the active position.
- 💳 Select “Security Item Location” and specify your preferred service (e.g, HCE Wallet or SIM-map).
- 📡 Make sure that the notification curtain also activates the appropriate icon for quick access.
If you don't find NFC in the settings menu, it could mean that the hardware is missing from the model, so you can't have software activation, and it's also worth checking if In-Air mode is on, because it blocks all wireless interfaces, including Near Field Communication. Once In-Air mode is on, the module stops responding to external requests.
In some cases, especially after a firmware update, settings may go wrong. If you're sure of a chip but the menu is empty, try resetting the network settings. Go to Settings → Connection & Sharing → Reset Wi-Fi, mobile networks and Bluetooth. This action will not delete your personal data, but will return network settings to factory values, which often helps restore the operation of hidden modules.
Setting up payment with a smartphone and working with cards
One of the most popular features is contactless payment, which is a tokenization technology used on Xiaomi and Redmi smartphones, which means that when you pay for your card, you don't transfer your real data to the terminal, but a unique digital code, which minimizes the risk of theft of funds, and it requires careful attention and certain security conditions to set up the process.
To get started, you will need an account with the relevant payment service (Google Pay, Samsung Pay or alternative solutions available in your area) and a bank card with support for the technology. Open the payment system app, click Add Card, and follow the instructions on the screen. The smartphone camera automatically reads the data from the plastic, you just have to enter. CVV-code and confirm release through SMS.
An important aspect is the choice of security. In the NFC settings (Settings → Connection and Sharing → NFC → Security Item Location), you can choose where the encryption key will be stored. Usually the default option is HCE Wallet (Host Card Emulation), which emulates the card programmatically, which is the most versatile option that works with most modern terminals.
| Parameter | Description | Recommendation |
|---|---|---|
| Security element | Place of storage of encryption keys | HCE Wallet (by default) |
| Default application | A service that is launched when you submit | Your main payment application |
| Reading mode | Allows you to read tags. | Included (for work with passes) |
| Android Beam | Outdated file transfer protocol | Can be turned off to save resources |
When you pay with a Redmi phone, hold the top of the back panel to the terminal. You don't have to press the device close or hold it for a long time. A light touch for a split second is enough to read the signal. If the terminal has issued a characteristic sound or there is confirmation on the screen, the transaction is successful. In case of an error, make sure that the case does not contain metal plates that can shield the signal.
☑️ Checking readiness for payment
Transfer of files and data between devices
While payment is the most popular feature, data sharing remains extremely useful, especially when you need to quickly transfer photos, videos or contact without using the Internet. Unlike Bluetooth, which can search for devices and establish a connection for a long time, NFC makes this process instant. In the Xiaomi ecosystem, this feature is often integrated with the company’s Mi Share service, which speeds up the transfer of large files at times.
To transfer a file or contact over NFC, both devices must be unlocked and in close proximity (literally touching each other with their backs); the receiving device must display a notification of the incoming file; once confirmed by the user, data transfer will begin; the speed of transfer of the files themselves depends on the Wi-Fi Direct module, which is activated automatically after shaking hands over NFC.
The process of transferring contacts is even easier. Open the Contacts app on your Xiaomi, select the entry you want, and click Share. From the list of methods, select Android Beam or NFC. Bring your phone to your friend's device. Once the devices feel each other, the contact preview appears on the screen. Tap the screen for confirmation, and the business card will be saved to the person's phone book.
⚠️ Note: When transferring files, make sure you send data to the device that is nearby. Since the connection is automatically established on close contact, crowded places have the theoretical possibility of randomly activating a request on someone else’s device, although modern versions of Android require user confirmation.
It is worth mentioning that for the transmission of large amounts of data (video) 4K, Archives with games are better to use a direct Wi-Fi connection, which can also be initiated through the Internet. NFC-tag, if such a function is supported by a router or printer. NFC It acts as a trigger to run a faster transmission protocol, eliminating the need for the user to manually enter passwords from the Wi-Fi network.
Use of electronic keys and tags
The scope of NFC in Redmi smartphones goes far beyond payments, the technology is actively used to emulate physical access keys, it can be an office pass, an intercom key (if you use a compatible standard, such as RFID 13.56 MHz), or even a car key.
To copy keys, third-party applications or built-in Door Card functions are often used in the shell. MIUI. The cloning process looks like this: you hold the original key to the back of the phone, the app reads its unique identifier (UID) And then when you hold the phone to the intercom reader, the phone will broadcast the same signal as the original plastic fob.
But there's a big technical nuance here: Most modern security systems use encryption, and if your intercom key has an encrypted chip (like Mifare DESFire), simply copying the UID may not work, and in these cases, more complex authorization is required that standard smartphone tools can't do, but for simple access cards without encryption, the method works flawlessly.
Can I copy the key to the intercom on Xiaomi?
In addition to keys, NFC tags can be used to automate tasks. By buying a set of programmable tags (NFC Tags), you can customize scripts. For example, touching a phone to a tag on the bedside table can automatically turn on Do Not Disturb mode, an alarm clock, and turn off Wi-Fi. In-car tags can start the navigator and turn on Bluetooth. There are many applications for programming such scripts on Google Play, such as Tasker or NFC Tools.
Possible problems and ways to solve them
Despite the reliability of the technology, users of Xiaomi and Redmi can face a number of typical problems, most often associated with software failures, application conflict or physical obstacles, and understanding the causes of the problem will help quickly restore the functionality of the module without going to the service center.
One of the common problems is that the phone stops seeing cards or payment terminals, which may be because the default system has another NFC application. Check the settings: in the NFC → Payment section, your primary payment application (e.g., Google Pay or Mi Pay) should be selected by default. If there is a “No” or other application, the terminal will not receive a response from the phone.
And there may be problems with thick or metal covers, and aluminum plates, magnetic holders, or just very dense silicone can shield the antenna at the top of the case, and if you notice that you have to take off the case to pay, that's why, and in these cases, it's only to replace the accessory with a thinner or specialized, non-shielding signal that helps.
Another cause of failure could be a software conflict: If you recently installed map or key applications, they might have taken control of the module. Try clearing the NFC Service app cache from the Apps menu → All Apps → Show System → NFC Service → Clear Data. This will return the module settings to their original state.
💡
If NFC is unstable, try restarting your smartphone in Safe Mode to determine if a third-party app is causing a crash, and if everything is working perfectly in Safe Mode, the problem is in one of the apps you have installed.
In rare cases, you may need to flash the device or reset to factory settings if the module is no longer defined by the system at all (the item in the settings has become gray or disappeared). However, before such radical measures, you should always check for system updates in the Settings menu → About the phone → Update MIUI. Often the manufacturer releases patches that correct errors in the wireless interfaces.
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Most NFC problems on Xiaomi are solved by checking the security settings and removing the metal case.