NFC Xiaomi Mi 9T: Complete instructions for setting up and applying in 2026

Xiaomi Mi 9T

2019

NFC

Mi 9T

In this article, we will discuss all the ways of using NFC Xiaomi Mi 9T, From basic settings to advanced scenarios, we'll focus on common bugs (like why payments don't go through a case) and hidden features that aren't written about in the official instructions. NFC You only need contactless payments – you’re missing 80% of your smartphone’s capabilities.

Note: the manual is relevant for the global and European versions of the Mi 9T (In Chinese firmware (e.g. for the Redmi model). K20) Some functions may be missing or require additional manipulation.

1. How to turn on NFC Xiaomi Mi 9T: step-by-step

Before using NFC, You need to activate the module in the settings. 9T This is done in a few steps, but there are nuances that you should know in advance.

Open the Settings. → Connected devices → NFC. If there is no "Connected devices" item, use the search by settings (the magnifier icon in the upper right corner) and enter the request NFC.

Turn on the slider "NFC". When activated, it will be read Ready to Use, and you can also turn on the option "Android Beam" (for transferring files between devices) - but note that this feature is outdated and removed in new versions of Android. 9T s MIUI 12+ She may be absent.

To check the operability of the module, bring the phone to another device with NFC (It's like a payment terminal or a tag, and it's got to be a beep or it's got to be vibrating.

Enable NFC in the settings

Update MIUI to the latest version (if available)

Make sure the cover does not block the signal (thickness) ≤ 3 mm)

Check the compatibility of the banking application (for payments)-->

⚠️ Note: Some of the Mi's firmware 9T After upgrading to Android 11+ option NFC It can reset after it's rebooted. MIUI — The solution is described in the section "Frequent problems".

Contactless payments: setting up Google Pay and alternatives

Principal application NFC — Paying for purchases with a smartphone. 9T Google Pay (now Google Wallet) or banking apps with support HCE (Host Card Emulation: Consider both options.

For Google Pay:

1. Install the Google Wallet app from the Play Market.
2. Add a bank card: Open the application → press Add map → scan the map or enter data manually.
3. Confirm the addition via SMS or push notification from the bank.
4. Unlock your phone and bring it to the terminal. You don't have to open the app, the payment will work automatically.

For banking applications (SberBank Online, Tinkoff, Alpha-Click, etc.):

• 📱 Install the official application of your bank.
• 💳 Go to the contactless payments section or "NFC-payment".
• 🔄 Activate the Pay by Phone option (can be called Add to Google Pay or Virtual Card").
• ⚠️ Some banks require binding to a specific device - after changing the phone, the card will have to be added again.

For successful payment, the terminal must maintain the standard EMV (If the payment does not pass, try to bring the phone to the top of the terminal (where the contactless payment logo is usually located).

Cash.

Bank card (physical)

Smartphone (NFC)

Smart watch or fitness bracelet

In other ways.-->

3. Transfer of data and files through NFC

Despite the fact that Android Beam officially stopped supporting, Xiaomi Mi 9T You can transfer small files (contacts, links, photos) using alternative methods:

Method 1: Through the "Fast Panel"

• 🔗 Open the file you want to transfer (for example, a photo in a gallery).
• 📱 Press Share. → NFC (if there is an option).
• 🤝 Bring Mi. 9T junction NFC (distance ≤ 4cm).
• ✅ Wait for the beep – the transmission will start automatically.

Method 2: Using third-party applications

If standard features don’t work, install one of these apps:

• 📲 Send Anywhere – Transfer of files NFC + Wi-Fi Direct.
• 📲 NFC Tools – creating and reading tags, data exchange.
• 📲 Trigger – Automating tasks through NFC-tagging.

Limitations:

- Transmission speed through NFC 424 kbit/s (this is 10-20 times slower than Wi-Fi).

The maximum file size is about 1-2 MB (depending on the firmware).

For larger files, it is better to use Mi Share (the built-in feature of Xiaomi for transferring over Wi-Fi Direct).

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If NFC If you don't detect another device, try turning off and re-enable the module in the settings. Sometimes it helps to restart the phone.

4. Automation of tasks with NFC-marker

One of the most useful functions NFC — The ability to program tags (stickers or key fobs) to automate routine activities, such as setting up a setup:

• 🔕 Silent mode when touching the phone to the tag on the desktop.
• 🚗 Starting the navigator and connecting to a Bluetooth magneto in the car.
• 🌙 Enabling night mode and blocking notifications before bedtime.
• 📶 Activating mobile internet and turning off Wi-Fi in certain locations.

This will require:

1. NFC-tags (you can buy on AliExpress or in electronics stores, are worth it) ~50–200 ₽ piecewise).
2. Recording app: NFC Tools, Trigger or Automate.

Instructions for setting the label to turn on Wi-Fi:

1. Open up. NFC Tools → Go to the Tasks tab.
2. Click Add Task Add Task → Wi-Fi.
3. Select your network and enter your password.
4. Hold the phone to a clean label and wait for the recording.

Now, by touching the Mi 9T The Wi-Fi tag will be automatically activated.

Compatibility NFC on Mi 9T device-wise

Module NFC Xiaomi Mi 9T standardize ISO/IEC 14443 Type A/B and NFC Forum Type 1–4, It's compatible with most modern devices, but there are nuances:

Incompatibility with transport cards is especially worth noting. Unlike the flagship models of Xiaomi (for example, Mi 11), Mi 9T squirrel MIFARE, So you can't tie a Troika or a Strelka to it, and the alternative is to use a bank card with a linked transport application (like a Tinkoff card with a Troika option").

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NFC on Mi 9T It does not replace transport cards, but it does a great job with payments, automation and management of smart devices.

Frequent problems and their solutions

Even with the right setup NFC Xiaomi Mi 9T These are the most common mistakes and how to fix them:

Problem 1: NFC does not turn on or spontaneously disconnects.

• 🔄 Reboot the phone.
• 📱 Check if there are any energy-saving applications (such as Greenify or Battery Doctor) that can block the module.
• 🛠️ Reset network settings: Settings → System system → Resetting settings → Resetting Wi-Fi, Mobile Network and Bluetooth.

Problem 2: Payments don't go through the case.

• 📏 Make sure the cover is less than 3 mm thick. Metal or magnetic covers block the signal.
• 📍 Try to bring the phone to the terminal from a different angle (antenna). NFC located at the top of the Mi 9T).

Problem 3: Google Pay doesn’t see a bank card.

• 🏦 Make sure your bank supports you. HCE-Payments (list of supported banks available on Google website).
• 📋 Check if the developer mode is enabled with debugging USB — It can block payments.
• 🔄 Update the Google Wallet app to the latest version.

⚠️ Note: If after the update MIUI NFC stopped working, try to roll back to the previous firmware version through Settings → The phone. → Updating the system → Three points. → Select the service pack. Some builds MIUI 12.5+ bug-in NFC-module.

7. Advanced scenarios: smart home and IoT

NFC Xiaomi Mi 9T You can integrate it into a smart home system:

• 🏠 Lighting control: Touching the tag at the door turns on the light via Mi Home or Yandex Alice.
• 🔊 Starting scripts: a tag on the bedside table activates the "Sleep" mode (turns off sound, turns on "Do not disturb").
• 🚪 Access control: NFC-The key fob opens the smart lock (compatible models: Nuki Smart Lock, Aqara Door Lock).

You'll need to set up:

1. Install the Home Assistant app (for advanced users) or Mi Home (for Xiaomi devices).
2. Create Automation with a Trigger NFC-marker.
3. Sign up for the command through NFC Tools or Tasker.

Example of settings for Mi Home:

1. Open Mi Home → Automation → Add → Smart button.
2. Choose. NFC-trigger-mark.
3. Add an action, such as Turn on the Yeelight lamp.
4. Hold your phone to the tag to tie it to the script.

Limitation: to work with smart devices through NFC The phone and tag must be on the same Wi-Fi network (or the phone must have access to the manufacturer’s cloud, such as Mi Cloud).

8 Security: How to protect data when used NFC

NFC — It's a radio interface, so it's theoretically interceptable, but in practice, the risks are minimal because of the short range (≤ 10 cm) and encryption. However, it's worth following simple rules:

Precautions:

• 🔒 Turn it off. NFC, When not used (for example, on public transport).
• 🛡️ Do not store sensitive data (passwords, PIN-codes NFC-tagged.
• 📱 Use the lock screen (PIN, pattern lock or fingerprint – without it, payments via Google Pay do not work.
• 🔄 Regularly check the list of connected devices in the settings NFC.

What to do if your phone is lost:

1. Remove your bank cards from Google Pay via the web version of the service.
2. Lock your device through Find My Device (or Mi Cloud if you use Xiaomi’s account).
3. Contact the bank to block virtual cards.

It's important: NFC-module 9T It doesn't automatically transmit data -- any operation requires unlocking the phone and user confirmation, which makes it safer than, for example, the user, RFID-Cards (which can be considered without the owner’s knowledge).

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NFC on Mi 9T Secure for payments thanks to tokenization (bank data is not stored on the phone) and mandatory authentication.

FAQ: Answers to Frequent Questions