How to use NFC on Xiaomi Redmi 9: a complete guide with settings and life hacks

Why do you need NFC in the Xiaomi Redmi 9?

The NFC (Near Field Communication) module in Xiaomi Redmi 9 is not just a “payment chip”, but a full-fledged tool for quickly exchanging data, managing smart devices and even automating routine tasks. Many owners do not even suspect that their budget smartphone supports the technology that is in flagships for 100+ thousand rubles. In this article, we will analyze all the scenarios for using NFC – from the usual contactless payment to hidden functions that are not written in the official instructions.

Let’s answer the main question: Redmi 9 (model M2003J15SC) fitted NFC-module NXP PN54T, frequency-operated 13,56 MHz and maintains standards ISO 14443 (type A/B) and ISO 18092. This means that the smartphone is compatible with most banking terminals, automation tags, and even some access control systems, but there are some nuances: for example, in the version in India (M2003J15SI) NFC missing – check the markings on the box or in the settings.

If you've never used NFC, it might seem useless, but after reading this article, you'll learn how to:

• 💳 Set up Google Pay and Mi Pay for phone payments (including linking multiple cards).
• 🔄 Fast transfer of files, contacts and links between devices without the Internet.
• 🏠 Manage a smart home (lamps, locks, thermostats) with one touch.
• 🚗 Use your smartphone as a key to your car (if supported).
• ⚙️ Typical problems to solve: "NFC It doesn’t work, the terminal doesn’t see the phone, and others.

How to enable NFC on Xiaomi Redmi 9: step-by-step instructions

Before you use NFC, you need to activate it in settings. Redmi 9 does this in 3 steps:

1. Open the "Settings" (the gear icon on the desktop or in the application menu).
2. Go to Connect and Sharing (or Wireless Networks in some versions of MIUI).
3. Slip on the NFC item and move the slider to the "On" position. You can also turn on the Android Beam option for data exchange.

After activation, an NFC icon (a stylized letter "N") will appear in the top notification bar. If it is not, check if your version of Redmi 9 supports this technology (see the Problems and Solutions section).

Whether it's on NFC customized?|Is the smartphone screen unlocked?|Is the device in the range of the terminal (up to 4 cm)?|Does your bank support contactless payments?-->

Important: NFC on Xiaomi only works when the screen is unlocked (except for payments via Google Pay, where unlocking occurs automatically when you reach the terminal).If the screen is turned off, the module is turned off to save battery power.

Contactless Payment: Google Pay and Mi Pay setup

The main use of NFC is payments. Redmi 9 has two services:

To set up Google Pay:

1. Download the app from Google Play Market.
2. Open it and tap "Add map."
3. Scan the map with the camera or enter the data manually.
4. Confirm the binding via SMS or push notification from the bank.
5. Now, you just have to unlock the phone and bring it to the terminal.

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If the terminal is not reading the payment, try holding the phone to the top of the terminal (where the bank logo is usually located). NFC-The antenna in Redmi 9 is located closer to the upper edge of the body.

Important: Payment of over 1,000 rubles (some banks have 3,000 rubles) will require entering a PIN at the terminal, a requirement of the Central Bank, not a smartphone restriction.

⚠️ Note: Some terminals in subways and small shops may not support payment via NFC. If after 3 attempts the payment does not pass, ask the cashier to conduct the operation through a chip or magnetic stripe.

NFC Data Transfer: How to Share Files and Contacts

NFC allows you to transfer small files (up to 1 MB) between devices without the Internet. This uses Android Beam technology (newer versions of Android — Fast Share).

1. Enable NFC on both devices (see section above).
2. Open the file, contact, or web page you want to transfer.
3. Bring the Redmi 9 back to another smartphone (distance is not more than 2 cm).
4. Wait for the sound signal or vibration – the transmission will start automatically.

Limitations:

• 📱 Transfer speed is about 400 Kbps (slower than Bluetooth, but more convenient for small data).
• 📎 Supported formats: Contacts (VCF), links, text, small images.
• 🚫 You can’t send videos, music or documents of large size.

If the transmission fails, check:

• 🔋 Battery level (at a discharge below 15% NFC may be off).
• 📶 The presence of interference (metallic objects or other NFC-sideways).
• 🔄 Device compatibility (Android Beam doesn’t work on all smartphones).

Smart home and automation: NFC-labels and their application

S NFC-marker (NFC_tags) Xiaomi Redmi 9 It turns into a smart home remote control, and the tag is a small chip, NTAG213 or NTAG215), It's a device that can be programmed to perform actions when you touch a phone:

To set up:

1. Buy it. NFC-tags (cost from 50 rubles per piece on AliExpress or in the "Coherent").
2. Install the NFC Tools app from Google Play.
3. Open the application, select “Write” and set up the action (such as launching the application or changing settings).
4. Put the tag on the back cover of Redmi 9 – the data will be recorded.
5. Stick the label to a convenient place (for example, on a table, in a car or on a door).

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NFC-tags can be used to automatically turn on mobile Internet when you touch the phone to the tag on the desktop, which eliminates the need to manually switch modes.

Lifehack: If you have Xiaomi Yeelight smart bulbs, you can program the label to turn on a specific lighting scenario, for example, touching the phone to the label on the nightstand will turn on a nightlight with a warm light.

NFC problems on Xiaomi Redmi 9: causes and solutions

Even on a budget smartphone, NFC is usually stable, but sometimes it crashes. Here are the typical problems and solutions:

If the NFC has stopped working after the MIUI update:

1. Reboot the phone.
2. Reset network settings: Settings → System → Settings Reset → Reset settings Wi-Fi, mobile network and Bluetooth.
3. If it does not help - perform a reset to factory settings (pre-return).

⚠️ Warning: Some cases with metal inserts or magnets may block the signal NFC. If the problem started after changing the cover, try removing it before using it.

NFC: What else does your Redmi 9 do?

In addition to paying for and transferring files, NFC in Xiaomi Redmi 9 can be used for non-obvious tasks:

• 🚗 Car Key: Some cars (such as Hyundai or Kia with Digital Key) allow you to open doors and start the engine through the vehicle. NFC. Check the compatibility of your model on the manufacturer’s website.
• 🎫 Electronic tickets: In the subway of Moscow, St. Petersburg and other cities, you can pay by phone through the Troika or Strelka apps.
• 🔑 Access control: Some offices and entrances are equipped NFC-Check with the administrator if you can use a smartphone instead of a blank key fob.
• 🎮 Gaming accessories: Xiaomi Gamepad controllers or 8BitDo support the conjugation of NFC fast-wire.

Experimental function: In some firmware MIUI there's a hidden option NFC-A simulation of a card that allows you to emulate a bank card or pass without being tied to Google Pay:

1. Enable Developer Mode: Settings → About Phone → MIUI Version (Tap 7 times).


2. Return to Settings → Additional → For developers.




3. Find the NFC- card emulation option and select the type you want.

Note: Using card emulation may violate bank and access control regulations. Please check the legality in your area before using it.

FAQ: Frequent questions about NFC on Xiaomi Redmi 9