The modern Xiaomi Redmi Note 9 is a powerful multimedia center that users often use not only to communicate but also to solve everyday tasks. One of the key features that simplify everyday life is the Near Field Communication module, which allows you to exchange data and make payments by touch. Many device owners buy gadgets without even realizing the full potential of embedded communication technologies.
Activating this feature allows you to quickly pair with accessories and contactless transactions in retail outlets. However, standard settings of the MIUI shell sometimes hide the necessary switches or require additional manipulations to work correctly. In this guide, we will discuss the configuration process in detail, check the compatibility of cards and eliminate possible errors.
Search and activate the NFC module in the system
The first step to get started is to detect the switch in the operating system interface. On Xiaomi devices, wireless interface management is put in the top curtain of notifications, making the process as convenient as possible. You need to swipe down the screen from top to bottom to open the quick access panel where the icons of the main functions are located.
If you don't see the NFC logo among the standard buttons, you'll need to expand the list of available widgets. Swipe left at the bottom of the curtain or tap the edit icon (usually three dots or a pencil) to drag the hidden button to the visible area of the screen. Once you find the right item, just tap it to activate the search and transfer mode.
An alternative route is through a deep settings menu where all device settings are concentrated. Go to Settings → Connection and Sharing, where the main status switch of the module is located. In some versions of MIUI firmware, this item may be called simply "NFC" or in the category "Wireless Networks".
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To quickly check the operation of the module, bring the phone on to the payment terminal - when the device is active, it will emit a characteristic sound signal or vibrates.
Configure contactless payment via Google Pay
The main use case for most users is in-store payment. To implement this feature, the Redmi Note 9 requires the presence of the Google Pay app (or its counterparts, such as Wallet, depending on the region and version of the software), it is important to make sure that the device has all the necessary services Google Play, as without them a secure transaction is impossible.
The process of adding a credit card requires attention to detail and a stable Internet connection. Open the payment system application, press the add card button and follow the instructions on the screen. The system automatically reads the data from the plastic through the camera or allows you to enter it manually, then sends a request to the bank for verification.
⚠️ Note: For successful payment, make sure that the settings NFC Google Pay (or Wallet) is selected as the default primary application. If another application is selected, the terminal may not see the payment data.
Transaction security is ensured by tokenization, where the real card number is replaced by a virtual code, which means that even when data is intercepted, attackers will not gain access to your account, and that confirming payment for amounts above a certain limit often requires unlocking the screen through a fingerprint or pattern lock.
☑️ Checking readiness for payment
Transfer of data and files between devices
In addition to financial transactions, the technology allows instant transfer of files, contacts and links between smartphones.To exchange data, both devices must have an activated communication module and be in close proximity to each other, usually no more than 10 centimeters away, this method is much faster than Bluetooth and does not require complex pairing or entering passwords.
To send a file, open a gallery or file manager, select the desired object and click the "Share" button. In the list of available methods, select the option Android Beam or "Send via NFC", then hold the back panels of devices to each other, and after the audible confirmation, the data transfer will begin, the status of which will be displayed on the screen.
It's worth noting that the speed of transferring large amounts of data can vary depending on the type of file and the load of communication channels. This method is ideal for photos and documents, but for multi-gigabyte video, it is better to use Wi-Fi Direct or cloud storage. However, for fast transfer of a couple of pictures or a business card of a contact, this solution remains one of the most convenient.
Why can the transmission be interrupted?
Use of access cards and transport application
Xiaomi Redmi Note 9 owners can use their smartphone as a digital pass or transport card, and you need to select an emulator app that mimics a plastic card chip in your settings, especially for residents of large cities where subway turnstiles and buses are equipped with next-generation readers.
The process of configuring transport cards depends on the region and the operators supported. In the wallet application or specialized software from the carrier, select the option to add a card, scan the plastic or enter its number. Once successfully linked, the phone turns into a full-fledged ticket, which is always with you.
| Type of card | Required annex | Internet is required | Support for Redmi Note 9 |
|---|---|---|---|
| Bank card | Google Pay / Wallet | Only when added | Complete. |
| Transportation | Carrier's annex | To replenish | Depends on the region. |
| Office pass | Specialized software | No. | Partial |
| Mi Pay | Mi Wallet | To set up | Limited. |
If your pass uses 125 kHz instead of the standard 13.56 MHz, the phone will not be physically able to read or play it, and in such cases, you will need to check the specifications of the card with the security administrator.
Diagnostics and Problem Solving with NFC Work
If the payment or data function fails after activation, you need to diagnose the system. Most often the problem lies in a software failure or application conflict. First of all, try restarting the device, as this action clears the RAM and restarts all system services, including the drivers of the communication module.
The second common reason is the presence of a protective case with a metal plate or magnetic fastener.The metal shields the signal, and the antenna located at the top of the back cover of the Redmi Note 9 can not establish a connection to the terminal.
⚠️ Note: If the module is no longer identified in the system after a phone drop or moisture is hit, the antenna plume is probably damaged.
Also worth checking for operating system updates. Xiaomi developers regularly release patches that fix bugs in the wireless interfaces. Go to the update menu and check the relevance of the MIUI version. If the problem persists, try resetting the network settings, but remember that this will remove saved Wi-Fi passwords and Bluetooth settings.
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90% of NFC problems are solved by simply restarting the device or removing a thick protective case that blocks the signal.
Impact of energy saving settings on the module
Aggressive MIUI energy saving policies can force the NFC module to be turned off to save battery power, especially when using "Energy Saving" or "Ultra-Saving" modes, where the system limits the background activity of applications. If you notice that the function spontaneously shuts down, check the battery settings.
To keep payment systems running, you need to add an app to the exceptions: Go to the battery settings, find Google Pay (or any other app you use), and set the "No Limits" mode, which will allow the background processing system to work correctly even when the screen is locked.
Also, some custom themes may conflict with system services. If you installed a third-party theme from MIUI Themes and then NFC stopped working, try bringing back the standard design. Visual modifications sometimes affect the system files responsible for displaying the status of wireless networks.