Modern smartphones have long ceased to be just devices for calls, becoming universal tools for managing everyday life. Xiaomi Redmi 9T is a bright representative of this class of gadgets, offering users not only a powerful battery and a quality screen, but also advanced wireless technologies. One of the most popular features that interests owners is NFC (Near Field Communication), which allows you to make contactless payments and instantly exchange data.
Many users, first encountered with the interface MIUI, They may not find the switches they need or understand how the module works, and activating this option opens up access to digital wallets, making the payment process in stores as quick and convenient as possible. NFC-module on your device to ensure it works safely and stably.
It is important to understand that the correct operation of the technology depends not only on the hardware, but also on the software security settings. Redmi 9T is equipped with a reliable chip that, when configured correctly, can replace a physical wallet and bank cards. Let's move to the practical part and consider a step-by-step algorithm for activating the service.
Module location and primary activation of the function
Before you start to set up complex payment system settings, you need to make sure that the communication module itself is on and functioning correctly. In the Redmi 9T model, the NFC antenna is usually located at the top of the case, closer to the main camera, which is the standard for most modern smartphones. To get started, you will need to perform a few simple actions in the settings menu to activate the radio module.
The first way to activate is the fastest and most accessible through the control panel. You need to swipe your finger across the screen from top to bottom to open the "Stork" of notifications and quick settings. Find an NFC icon among the icons and click on it to light up in blue, which will indicate successful activation. If there is no such icon in the expanded menu, click on a pencil or three dots to edit the list and drag the icon to the active panel.
The second way is to go deeper into system settings, where you can find additional settings for the module. Go to Settings → Connection and Sharing → NFC. Here you will see the main switch that needs to be switched to active position. It is in this menu that the default application for contactless transactions is also configured.
☑️ Verification of activation NFC
After the module is enabled, the system may suggest selecting an emulator app if you have multiple payment programs installed. For standard use in conjunction with Google services, it is recommended to choose Google Pay (or its current counterparts, such as Wallet), as this ensures maximum compatibility with terminals.
⚠️ Attention: When activated NFC The module starts to consume energy, albeit in minimal amounts. If you don't plan to use the feature for a long time, it's better to turn it off to save battery life, especially considering that Redmi is a powerhouse. 9T Often used in standby mode for several days.
Configure contactless payment via Google Pay and analogues
The main use case for most users is in-store payment. For your Xiaomi Redmi 9T to be authenticated at terminals, you need to set up your digital payment system correctly, and the process is based on linking your credit card to a secure wallet application.
First, make sure that the device has the services you need: you need a Google account linked to your smartphone and a Google Pay app installed (or another supported app if Google services are limited in your area). Open the app and follow the on-screen instructions to add a new card: you can scan it with your camera or enter data manually.
The bank will definitely carry out the verification procedure, which can take from a few seconds to a couple of minutes. SMS-If you have a code, you need to confirm the transaction through a banking application, and if you successfully link the card, it will appear in the list of available means of payment, and the phone will be ready to make transactions.
- 📱 Make sure the default card is displayed on the lock screen or in the active application.
- 🔒 For payment security, a reliable blocking method must be installed on the device: a pin code, a pattern lock or a fingerprint.
- 💳 When paying, you do not need to open the application, it is enough to simply unlock the phone and bring it to the terminal.
- 📶 The Internet is not required for payment at the time of the transaction, but is periodically required for card tokenization.
It is important to note that MIUI has its own background processes, so sometimes the system needs to explicitly allow the payment application to work. Go to the battery settings, find your payment application, and select No Limits mode so that the system does not kill the process in the background.
What is data tokenization?
Using a Smartphone as a Key and for Data Exchange
NFC is not limited to financial transactions, although they are the most popular. Your Redmi 9T can act as a universal key, a reader or a tool for fast interconnection with other devices, this is especially convenient for automating household tasks and working with a smart home.
One of the interesting possibilities is reading and writing. NFC-You can buy special programmable tags, stick them on, for example, a bedside table or in a car, and when you touch a phone tag, the smartphone can automatically perform the specified actions: turn on the alarm, start the navigator or switch modes.
It's also used to pair with accessories quickly, and many of today's headphones, speakers, and fitness bracelets support NFC Pairing, and instead of looking for a Bluetooth device for a long time, simply hold the phone to the accessory and the connection will be automatically established.
| Type of action | Required condition | Reaction rate | Example of use |
|---|---|---|---|
| Payment | Active screen, unlocking | <<1 second | Supermarket, transportation. |
| Pairing. | Bluetooth enabled | 2-3 seconds | Headphones, speakers |
| Reading the tag | Labelling annex | Instantly. | Automation of scenarios |
| Transmission of photo | Android Beam (older versions) | Depends on size. | Exchange of contacts |
For advanced users, third-party apps from the Play Market store can be installed to extend the ability to work with tags, and they can create complex automation scenarios where one touch of the back of a smartphone triggers a whole chain of actions in the system.
Work with transport maps and passes
Xiaomi Redmi 9T owners are often interested in using a smartphone instead of a plastic transport card. In theory, NFC technology allows you to emulate Mifare maps, but in practice, this depends on the region and type of card used in your city.
In some countries and regions, the “Transport Card” feature is built right into the Mi Wallet or Google Pay system application. If your card is supported, you can top up your balance directly from your phone and attach it to the turnstile.
If you don't have direct emulation supported by your bank or transport operator, there are alternatives, and some apps allow you to read the balance of your card by holding it to the back of your phone, which is convenient for cost control, but not for fare.
It is worth considering that for transport to work, the phone must be turned on, but the screen can be turned off (depending on the implementation of Host Card Emulation technology).However, unlike payment, where even a switched-off phone works (in some implementations), transport systems often require active authorization.
⚠️ Warning: Do not attempt to clone access cards to an office or intercom with a high level of protection. NFC redmi 9T It runs at 13.56 MHz and will not be able to copy old-format (125 kHz) cards, which are often used in simple intercoms.
Diagnostics and troubleshooting of modules
Even a reliable device like the Redmi 9T can have software failures that prevent wireless interfaces from working properly. If you notice that your phone has stopped "seeing" cards or payment terminals, you need to do a diagnostic, and often the problem is not the hardware, but a software conflict or service failure.
The first step should always be to restart the device in a banal way, which clears the RAM and restarts all system services, including drivers. NFC-If the problem persists after the reboot, check if there is a case on the phone with a metal plate or magnet that shields the signal.
In more complex cases, you may need to reset your network connection settings. Note that this action will delete stored Wi-Fi networks and Bluetooth pairs, but will not affect your personal data. Follow the Settings path → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth.
- 🔄 Check for system updates in the About Phone menu, as new patches often contain bug fixes for communication modules.
- 🧹 Clear the cache of the Google Pay or Mi Wallet app through the App Management Menu.
- 🛡️ Make sure that security settings do not include modes that block the work NFC (For example, some antiviruses).
- 🔍 Use the engineering menu to check the status of the module by entering the code ##6484## and selecting the test. NFC.
If software methods don’t work and the phone doesn’t respond even to reading simple tags, there may be physical damage to the antenna or plume, in which case, especially if the device has been hit or moisture, a diagnosis at the service center will be required.
💡
Most NFC issues on Redmi 9T are solved by simply restarting the device or updating the Google Pay app to the latest version.
Security and data protection issues
Using a smartphone for payments raises questions about the security of personal data. Xiaomi Redmi 9T is equipped with modern encryption protocols that make the payment process even more secure than using a plastic card. When you transact, your card number is not transferred to the terminal, instead, a one-time virtual account is used.
In addition, to perform any operation above a certain limit (or after a certain time of inactivity), the system will necessarily require unlocking the device. PIN-code, pattern lock or fingerprint scanning through the built-in scanner in the switch button.
If you lose your phone, you can remotely block access to payment features. Google's Find My Device service allows you not only to track the location of the gadget, but also completely erase data or lock the device, which instantly makes it impossible to conduct any transactions through NFC.
There is no need to fear the accidental reading of data by hackers. NFC is only a few centimeters in range, and it requires active interaction with the terminal to initiate payment. It is technically impossible to read data “at a distance” through a pocket or bag using standard equipment.
💡
For maximum security, set up a mandatory biometric payment confirmation (fingerprint) on Google Pay for every transaction, even small ones. This will take a split second, but protect your funds.