Owning a modern smartphone involves a variety of hidden features that make everyday life much easier. One of these technologies is Near Field Communication, or NFC, which allows you to exchange data over ultra-small distances. Owners of budget devices often wonder how this module is implemented in their gadget and whether it can be used to pay for purchases in stores.
The Xiaomi Redmi 9 has its own unique features that are important to consider when buying or setting up, because it has been introduced in various versions, and the availability of a communication chip depends on the specific region of sales and the firmware version. Understanding these nuances will help avoid disappointment and properly configure the device for contactless payments or fast pairing with accessories.
In this article, we will take a closer look at the wireless module architecture in your phone, how to activate hidden features, what apps are needed to work in Russia, and what to do if standard payment methods fail, and will be useful for both beginners and experienced users who want to make the most of their Redmi 9.
Features of hardware implementation of NFC in Redmi 9
The first thing that users encounter when studying the specifications is the lack of a single standard for all released devices. The global version of the smartphone, designed for markets in Europe and Asia, often comes with a full-fledged chip. NFC-The controller, while versions for some other regions may be physically deprived of this module, is due to the marketing policy of the manufacturer, seeking to reduce the final cost of the product.
Technically, the module in Xiaomi Redmi 9 is an antenna integrated into the back cover or battery compartment and a control chip associated with the motherboard. The frequency is standard 13.56 MHz, which ensures compatibility with most payment terminals and transport cards. However, data transfer speed is limited by the protocol, so the module is not designed to transmit large amounts of information such as video or heavy applications.
⚠️ Attention: Availability of menu item NFC customized MIUI It doesn't always guarantee the physical presence of the chip in the device, and in some cases, it's a software shell that doesn't activate the missing hardware.
To accurately determine the configuration of your device, it is recommended to use specialized diagnostic tools, which read the identifiers of the equipment and give an accurate report on the availability of all communication modules, this is especially true when buying a used device, when the seller may not know the technical details of a particular modification.
How to check for NFC module in Xiaomi
There are several reliable ways to ensure that the necessary equipment is available before you try to set up, the easiest method is to visually inspect the case of the smartphone. The NFC logo is sometimes applied on the back or in the area of the camera, which is a direct indication of the presence of functionality. However, the absence of marking does not always mean that the module is missing, since manufacturers often save on printing logos.
A more accurate method is to check through the system settings menu, go to Settings → Connection and Sharing and look for an NFC switch. If this is missing completely, it is likely that there is no chip in the device. If the switch is present, but when it is turned on, an error appears or it immediately turns off, this may indicate a software failure or the absence of an antenna.
The third way involves using third-party software from the Google Play store, apps like NFC Check or AIDA64 conduct in-depth diagnostics of the system, they display a list of all the sensors and communication modules available, and if the sensor lists NXP or another communications chip manufacturer, then the security is available.
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Use the AIDA64 app to get a complete list of sensors. The "NFC" section should display "Present" or "Available" status.
You can also use the engineering menu by typing a special code in the phone book. ##6484## opens the test mode where you can check the performance of all components. Select the item associated with NFC and follow the instructions on the screen to test the module's response.
Configure and activate the function in MIUI
Once the module is confirmed, you need to configure it correctly for comfortable use. The standard action algorithm involves turning the main switch on the quick access menu or through system settings. To do this, lower the notification curtain and find the NFC icon, tap it to activate. In some versions of MIUI firmware, this item may be in the Tools folder.
The important step is to choose the security element: the NFC settings menu must specify which application will be used by default for emulation of cards. For payment systems, it is usually Google Pay (depending on the region) or Mi Pay. Transport cards can be used by separate applications of banks or transport operators. The correct choice of priority will eliminate the need to constantly switch modes manually.
☑️ Setting up NFC
Special attention should be paid to lock screen settings. To make a payment, the smartphone must be unlocked, so the payment function will not work when the screen is off. Make sure you have a reliable authentication method: a pin code, a pattern lock or a fingerprint scanner. Without this, many banking applications will refuse to add cards for security purposes.
The “Unlock Only” mode is also available in the settings, and it is recommended to enable it to prevent unauthorized devices from accidentally reading data when the phone is in your pocket, which adds an additional layer of protection to your personal data and financial information.
Using Google Pay and Mi Pay to Pay
The main feature most users are interested in is contactless payment for purchases. In Xiaomi smartphones, this process is implemented through virtualization of bank cards. You add your plastic card data to the bank or payment system application, after which the phone begins to broadcast an encrypted signal identical to the signal of the original card.
To set up Google Pay (or its analogues depending on the region), you need to add a Google account and link the card. The application automatically checks security support and adds a card to the system. When paying, just bring the top of the smartphone, where the antenna is located, to the terminal. A characteristic sound signal will confirm the successful transfer of the token.
| Parameter | Google Pay | Mi Pay | Bank's annex |
|---|---|---|---|
| Support to the Russian Federation | Limited. | It works (Peace) | It works (Peace) |
| Limit without pin code | Depends on the bank. | Depends on the bank. | |
| Stability | Tall. | Medium | Tall. |
| Required Android | 5.0+ | 6.0+ | Depends on the bank. |
In the current environment, it is important to note that the work of payment systems can vary: Mir cards may not be added to Google Pay on new versions of Android, however, they work successfully through the Mi Pay app or direct banking applications if they support card emulation through the newer versions of Android. NFC. For that, in the settings. NFC You need to select the appropriate application as the main one.
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For payment with MIR cards in Russia, the most stable application is Mi Pay or a direct application of your bank with NFC support.
File transfer and device pairing
In addition to payment, NFC technology is widely used for fast transfer of small amounts of data and pairing devices. Unlike Bluetooth, it does not require a long search and input of confirmation codes. Just hold two smartphones with the module turned on to each other with the rear panels, and the system will offer to transmit a contact, a link to a site or a photo through the Android Beam protocol (or its modern counterparts).
This feature is also indispensable for connecting wireless accessories. Headphones, speakers, fitness bracelets and smart watches are often equipped with NFC tags. When you first connect, just tap the phone's tag on the device, and the smartphone will automatically go into Bluetooth pairing mode, establishing a connection in seconds. This eliminates the need to manually search the device in the list of available.
There are also special NFC-Labels that can be programmed to run scenarios, such as touching a phone to a desktop tag can automatically turn on an alarm clock, trigger a weather app, or switch the phone to silent mode. To create such scenarios, automated applications available in the application store are used.
⚠️ Note: File transfer speed through NFC The technology is only used to shake hands with devices, after which data is transmitted via Bluetooth or Wi-Fi Direct.
Solutions to Connection Problems and Errors
Despite the reliability of the technology, users can experience various failures: a common problem is that the phone does not see the payment terminal or stops responding to tags. First of all, you need to check whether the module is disturbed by a thick case or a metal plate on the back cover.
Another reason could be a software failure of the HCE (Host Card Emulation) service, in which case it helps to clear the cache of the application responsible for NFC, or completely restart the device. If the problem persists, it is worth checking for MIUI updates, since manufacturers often release patches that correct errors in the communication modules.
What if the NFC stopped working after the upgrade?
In rare cases, there is a physical breakdown of the antenna or plume, especially if the phone has been hit or moisture.If the software diagnostic and reset methods do not help, and the service menu does not identify the module, it is likely that the hardware components will need to be replaced in a specialized center.