NFC Xiaomi Mi Band 4: how it works, configures and applies in practice

Xiaomi Mi Band 4 NFC — One of the most popular contactless fitness bracelets, which is still relevant today because of its functionality and availability. NFC, But not everyone understands how it works, which banks are supported, and how to set up the right bracelet payment. NFC Mi Band 4, how to activate it, what limitations the technology has, and how to avoid common mistakes when using it.

Unlike other models (such as the Mi Band). 5/6/7 Mi Smart Band Pro, Mi Band Pro 4 NFC There are some features: a limited list of supported banks, dependence on the region and the need to be tied to a specific smartphone. If you just bought a bracelet or plan to do it, this guide will help you understand all the nuances of the work. NFC-Module and avoid disappointment.

What is NFC in Xiaomi Mi Band 4 and why you need it?

NFC (Near Field Communication is a short-range wireless communication technology (up to 10 cm) that allows you to exchange data between devices or make contactless payments.In Mi Band 4 NFC This module is used primarily for:

• 💳 Payment for purchases – the bracelet emulates a bank card and allows you to pay in stores that support contactless terminals (PayPass, PayWave).
• 🚇 fare – in some regions (for example, Moscow, St. Petersburg) you can link a transport card (Troika, Strelka).
• 🔑 Smart devices management – can be opened NFC-locks, enable scripts in Xiaomi Home (if supported).

It is important to understand that Mi Band 4 NFC is not complete NFC-It's a card emulation chip, like a smartphone, and it doesn't work:

• 📱 Reading data from others NFC-tags (for example, to automate tasks).
• 🔄 Transfer files between devices (like in Android Beam).
• 🔧 Work without being tied to a smartphone (Mi Fit or Zepp Life is required to set up).

How it works NFC Mi Band 4: Technical details

Module NFC Mi Band 4 chip-based NXP PN54T (or equivalent, which supports the standards ISO 14443 Type A/B and MIFARE. This means that the bracelet can interact with most contactless terminals, but there are important limitations:

In Mi Band 4 NFC technology HCE (Host Card Emulation, where the virtual image is stored in the protected memory area of the bracelet, which distinguishes it from physical cards with a chip, where the data is written directly on the plastic.

Features of Mi Band 4 NFC It does not have its own food source for NFC-The chip is activated by the energy transmitted by the terminal (as in contactless cards:

• ⚡ The bracelet is not discharged from use NFC — Payment does not affect working hours.
• 🔋 However, a charge of at least 20 is required for initial settings%.
• 📵 If the bracelet is completely discharged, NFC It stops working (even if you bring it to the terminal).

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If the terminal doesn't read the bracelet, try holding it to another part of the case - sometimes the antenna. NFC It is not in the center, but closer to the edge.

What Banks and Cards Does Mi Band 4 Support? NFC

The biggest drawback of the Mi Band 4 NFC — limited list of supported banks, which depends on the region of sale of the bracelet:

• 🏦 Sberbank (cards) Mastercard/Mir contactless).
• 🏦 Tinkoff (Mastercard only).
• 🏦 Alfa-Bank (Mastercard, since 2021).
• 🚇 Transport maps: Troika (Moscow), Strelka (St. Petersburg), EKARTA (Kazan).

Important: Visa and UnionPay are not officially supported in the Russian version of the bracelet, and you will not be able to tie:

• 💳 Virtual cards (such as Apple Pay or Google Pay).
• 💳 Corporate or debit cards without contactless options.
• 💳 Chip cards. MIFARE DESFire (used in some transport systems).

A full list of banks for other regions (Europe, China) can be found on the official website of Xiaomi, for example, in China, the bracelet supports Alipay and WeChat Pay, and in Europe – Mastercard and Visa from local banks.

Step-by-step instructions: how to set up NFC on Mi Band 4

To start using contactless payments, you need to:

1. Make sure you have a version of the bracelet with NFC (There must be an inscription on the box NFC contactless payment).
2. Update the bracelet firmware and the Mi app Fit/Zepp Life to the latest version.
3. Link the bank card through the application.

Detailed instructions:

1. Install the app: 📱 Download Mi Fit (for the first time) Android/iOS) Zepp Life (a new name for the same ecosystem). 🔗 Sign up or sign in to your Xiaomi account.
2. Put the bracelet on: 🔄 Turn on Bluetooth on your smartphone and add Mi Band 4 to the app. 📶 Wait for synchronization to be completed (the bracelet should appear in the list of devices).
3. Set up. NFC: 💳 Go to Profile. → Mi Band 4 → Contactless payments. 🔍 Select a bank from the list (for example, Sberbank). 📋 Enter the card details (number, expiration date, CVC) Or scan it through your smartphone camera. 🔐 Confirm the binding through SMS or push notification from the bank.

Activate payments:

• ✅ After successful binding, a notification will appear in the application.
• 🔄 Sync the bracelet (pull down on the Mi Fit home screen).
• 💡 The bracelet will have a card icon – now they can be paid.

Make sure the bracelet supports NFC (check the box)

Update the bracelet firmware and the Mi app Fit/Zepp Life

Have a bank card with contactless payments support (Mastercard/Mir)

Charge the bracelet at least 20%

Connect the bracelet to the smartphone via Bluetooth

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If the bracelet is not recognized by the terminal after the card is tied:

• 🔄 Reset the bracelet (press the touch button for 10 seconds).
• 📱 Reconnect it to your smartphone.
• 🔧 Check if the metal strap is blocking the signal. NFC (Try to remove the bracelet from your hand).

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You can only tie the card to one bracelet, and if you reset the Mi Band 4 settings, you'll have to reset the settings. NFC.

How to Pay for Mi Band 4 NFC: step-by-step

Payment from a bracelet is easier than from a smartphone — you don't have to unlock the screen or start the application.

1. Wake up the bracelet: 🖐️ Raise your hand or touch the touch button to activate the screen. 🔍 Make sure the card icon is displayed on the screen (if not, check the settings).
2. Bring it to the terminal: 📱 Place the bracelet at a distance of 1-2 cm from the reader. 🔄 Hold until the beep or tick appears on the terminal.

Confirm payment:

• 💳 If the amount exceeds the contactless payment limit (usually 1000-3000) ₽), You may need to enter a PIN code on the terminal.
• 📝 Check can be requested from the cashier (the bracelet does not keep the history of payments).

Important nuances:

• 🔋 The bracelet must be on (if it is turned off, NFC doesn't work).
• 🔒 For safety after 5 failed payment attempts, the bracelet may be blocked (requires a reconnection to the smartphone).
• 🌍 In some countries (for example, in China) to pay you must pre-unlock the bracelet PIN code.

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If the terminal gives an error "Card is not supported", try to link another card of the same bank - sometimes the problem is in the type of card (for example, Mir may not work in foreign terminals).

Typical problems with NFC Mi Band 4 and how to solve them

Despite the simplicity of the technology, users often face difficulties, and here are the most common mistakes and solutions:

Warnings that few people know about:

⚠️ Warning: If you reset the bracelet to factory settings (Settings) → Reset, all associated cards will be deleted, they will have to be reconfigured, and some banks may require confirmation through a call center.

⚠️ Attention: In Mi Band 4 NFC You can't tie multiple cards at once. If you need to change the card, first remove the old one in the Mi Fit app.

If none of the solutions worked:

• 📞 Contact the bank for support – sometimes the problem is on their side (e.g., the card is not activated for contactless payments).
• 🔧 Check if there are apps on the smartphone that block NFC (For example, some antiviruses or modules to save battery).

Comparison of Mi Band 4 NFC with other Xiaomi models

If you choose between Mi Band 4 NFC and newer models, it is worth considering their capabilities:

Conclusion: Mi Band 4 NFC This is the best option if you want a simple and inexpensive alternative to a credit card, but don’t count on advanced features.For traveling or working with multiple cards, consider the Mi Band 6 or newer.

FAQ: Frequent questions about NFC Mi Band 4