The modern Xiaomi Mi 9T is a powerful multimedia device that is difficult to imagine without a short-range wireless feature. NFC (Near Field Communication) technology has become the de facto standard for contactless payments, fast pairing with accessories and data exchange. Users often purchase this device precisely because of its flagship characteristics of the past generation, where the communication module plays a role in everyday operation.
Enabling this option on the MIUI or HyperOS shell may seem trivial, but there are nuances that affect the stability of payment systems. For example, the correct location of the antenna or the choice of the default application for emulation of cards requires attention. In this article, we will discuss in detail the entire process of activating, setting up security profiles and fixing the typical errors encountered by Mi 9T owners.
Incorrect settings can lead to the payment terminal simply not counting the device, which will cause an awkward pause at the checkout. To avoid such situations, you need to understand how the interaction between Host-based Card Emulation and Google system services works. We will consider not only the basic switching on the toggle, but also deep customization that will ensure maximum compatibility with the infrastructure of the outlets.
Where is the antenna and how to check for the module
The first step before you start any manipulation of the settings will be a physical understanding of the design of your Xiaomi Mi 9T. Unlike some budget models, where the antenna can be built into the battery compartment or absent at all, in this model the module is integrated into the main board.
The chip is checked by software through the system menu, and you don't have to disassemble the device or use third-party diagnostic tools, because MIUI gives you full access to this information, and if the module is hardware-friendly, the system will correctly display its status, even if the software function is disabled.
For quick diagnostics, you can use special applications from Google Play, such as NFC Check or NFC Tools, which read the specifications of the chip, supported standards (Type A, Type B, FeliCa) and current status of operation, which is especially useful if you buy a device from hand and want to ensure the integrity of all components.
⚠️ Note: If the settings menu is completely missing item NFC, Although the specifications of the model it is stated, it is possible that the device was subjected to unqualified repairs with the replacement of the antenna plume or the board itself.
Also, consider that metal cases or cards with a magnetic stripe placed on the back cover can shield the signal. For testing, it is best to remove all foreign objects from the smartphone body to exclude the influence of external factors on the quality of communication.
Activation of the function through the curtain and settings
There are two main ways to run a communication module: fast and deep. The first option is ideal for everyday use when you need to quickly pay for a purchase or transfer a file. The second is necessary for the initial configuration and solving problems with application compatibility.
For quick activation, swipe the notification curtain down from top to bottom. Find an NFC-marked icon and tap it. If the icon doesn't appear on the first screen, swipe right to open the full list of switches, find the one you want, and drag it to the active area. This action instantly triggers the radio module.
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To save battery power, activate NFC only before use, as in the background, the module periodically polls the field, consuming energy.
More detailed control is done through the main menu of options. Go to Settings → Connection and Sharing → NFC. Here you will see not only the switch, but also additional options, such as mode of operation and choice of payment application. This section is where the main setup of Xiaomi Mi 9T for working with different services.
The Security Element Position section often requires you to select the option. HCE Wallet for Google Pay and banking applications. SIM-card, payment systems may not see the device, as modern tokens are stored in the phone’s secure memory, not on the SIM card.
Contactless Payment for Google Pay and Mi Pay
One of the main reasons for using NFC is the ability to pay for purchases with a smartphone. In Russia and CIS countries, the most relevant setting is Google Pay (or its analogues, such as Google Wallet) and proprietary service Mi Pay.
To start, make sure that the device has all the necessary updates to the system and services of Google Play. Open the Google Pay or Wallet application, click the add card button and follow the instructions of the bank.
☑️ Pre-payment checks
An important aspect is choosing the default payment app. In the phone's NFC settings menu, find Touch and Pay (or "Default Payment App"). In the list, select Google Pay. If you don't, the phone may try to emulate the card through another app or request a choice each time it reaches the terminal.
Mi Pay is similar, but requires a Mi Account and a region where it is officially supported, and in some versions of firmware for the global market, this item may be hidden or inactive, which is normal behavior in certain markets.
⚠️ Note: When adding a card, the bank may refuse to tokenize if the device has root rights or unlocked the bootloader.
After successfully adding a card, try to make a test payment or simply hold the phone to the terminal. The screen should light up, and the device will emit a characteristic audible signal confirming the successful readout of the token.
File transfer and work with tags
NFC is not limited to financial transactions; it is great for fast transfer of small amounts of data, such as contacts, links to web pages or geolocation coordinates. The NFC and Android Beam (or its modern Nearby Share) bundle is often used to transfer files between Xiaomi phones.
To pass the contact, open the Contacts app, select the desired entry, and bring the back of your Mi 9T to the back of the other device. With active NFC, both devices will automatically pair, and a request for data will appear on the screen, which is much faster than manual input or search in messengers.
Also popular is the use of NFC-Labels are small chip stickers that you can program to do certain things, and if you put your phone on that tag, you can automatically turn on your Wi-Fi, start your navigator, or put your smartphone into Do Not Disturb mode. NFC Tools.
It is important to note that the data transfer speed over NFC is extremely low (about 424 kbps), so for the transfer of photos or video technology is used only for “handshake” – establishing a connection, after which the data is transmitted over a faster Bluetooth channel or Wi-Fi Direct.
Compatibility table and frequent problems
Despite the standardization of the technology, users may face various problems when using NFC on the Xiaomi Mi 9T. Below is a table that helps diagnose the most common situations and find a solution.
| Symptoms. | Possible cause | Decision |
|---|---|---|
| Terminal doesn't see the phone | Incorrectly selected application by default | In NFC settings, select Google Pay as the primary |
| Payment is not completed, card is not added | Loader unlocked or there is a Root | Use Magisk Hide or return the stock firmware |
| The phone vibrates, but there is no payment | Weak signal or antenna shift | Move the phone higher or lower at the terminal |
| NFC item missing from settings | System failure or disconnection in the engineering menu | Rebooting or resetting network settings |
A separate issue to mention is the unlocked bootloader problem, which many enthusiasts will unlock to install customized backups or to gain superuser rights, but this action violates the integrity of Google SafetyNet, which leads to blocking payment applications, which can be avoided, but requires additional technical knowledge.
If the phone vibrates when you're lifting to the terminal, but the payment doesn't go through, try repositioning the device. The antenna in the Mi 9T is at the top, so you need to put that sector on the terminal, not the center of the backrest, and sometimes it helps to remove the thick cover that creates the air cushion.
Security and hidden settings
Contactless payment security is based on tokenization, which means that the payment is not the real data of your card, but a one-time digital code, and even if an attacker intercepts this signal, he will not be able to use it to re-operate or restore the card number.
To increase the level of protection, it is recommended to set a mandatory payment confirmation. In the settings of Google Pay, you can activate the requirement to unlock the screen or enter PIN-This will protect your funds in case of loss of unlocked phone.
Can I turn off the reading of the labels?
There is also a hidden engineering menu available through dialer code, but it is not recommended to enter without proper qualifications. Changing the parameters of the radio module in this menu can lead to unstable communication or a complete shutdown of the function, the restoration of which will require flashing.
⚠️ Warning: Never agree to read. NFC-Attackers can tag tag tag tag tagged with a phishing site that will automatically open upon reading.
Check the list of devices that have access to your Google account regularly and delete those you no longer use.This is a standard digital hygiene procedure that is relevant for any modern smartphone, including the Xiaomi Mi 9T.
Advanced use cases and automation
Owners of the Xiaomi Mi 9T can go beyond basic settings and implement NFC into home automation. Using the Google Home app or third-party solutions like Tasker, you can create complex scenarios. For example, a tag by the bed can turn off the lights, wake the alarm clock and turn on the “Do not disturb” mode with a single touch.
Another scenario is to quickly start navigation in the car, so if you tag your phone, you can run Google Maps or Yandex.Navigator and turn on the Bluetooth headset just by putting the phone on the mount, and that eliminates the need to poke the screen while you're driving.
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Use of the NFC-Tagged to automate routine actions turns a smartphone into a powerful tool for managing the digital environment, saving the user time.
Such scenarios do not require deep programming knowledge. The interface of tagging applications is intuitive and allows you to choose from a ready-made list of actions: launch an application, send an SMS, turn on a flashlight, change volume and more.
Remember that the Xiaomi Mi 9T features a quality module that supports reading and writing, making it an excellent platform for experimenting with the Internet of Things (IoT).