NFC in Xiaomi Redmi 9: a detailed guide to the functions and configuration

Have you just purchased a Xiaomi Redmi 9 and noticed the mysterious acronym NFC in the specs? Or have you been using a smartphone for a long time but still don't understand why you need this module? In this article, we will understand what NFC in Redmi 9, how it works and where it will be useful in everyday life. Spoiler: it is not just a "useless chip", but a full-fledged tool for quick payments, data sharing and even automation of tasks.

Many users mistakenly think that NFC is the equivalent of Bluetooth or Wi-Fi, but in fact the technology solves a completely different problem. In Xiaomi Redmi 9, the NFC module is built into the top of the case (usually next to the camera) and works at a distance of up to 10 cm. The main advantage is an instant connection without passwords and a long setup. Just bring the smartphone to another device or terminal - and the action will be completed in a fraction of a second.

But there are nuances: not all versions of Redmi 9 support NFC, and in some regions the features may be limited, and then we will tell you how to check for the module, activate it and use it with maximum efficiency – from in-store payment to managing a smart home.

What is NFC and how does it work in Xiaomi Redmi 9?

NFC (Near Field Communication) is a short-range wireless technology designed to quickly exchange data between devices. Unlike Bluetooth or Wi-Fi, it does not require pairing and works almost instantly. In Xiaomi Redmi 9, the NFC module supports three main modes:

• 💳 Emulation card – a smartphone replaces a bank card, travel card or key card (for example, for the office) and is used for contactless payments via Google Pay or Mi Pay.
• 📱 Read/write mode – the phone reads information from NFC-tags (for example, in museums, on advertising posters) or records data on them.
• 🔄 Peer-to-Peer (P2P) — Data exchange between two smartphones (contacts, links, files) is slower than Bluetooth, but does not require configuration.

Technically. NFC redmi 9 frequency-operate 13,56 MHz and maintains standards ISO/IEC 14443 (for maps and ISO/IEC 18092 (for P2P). The data transfer speed does not exceed 424 This is enough to carry small packets of information, such as payment data transmitted by 0,1–0,3 Seconds, faster than you can blink.

It's important to understand that the NFC in Redmi 9 is a passive module, it doesn't consume power in the background and only activates when it's brought to another device, which means that the technology doesn't land a battery, unlike a constantly running Bluetooth or GPS.

How to check if there is NFC in your Xiaomi Redmi 9

Not all Xiaomi Redmi 9 models are equipped with NFC-For example, the base version of Redmi 9 (model number) M2003J15SC) It is often shipped without it, while the Redmi 9 is not. NFC (model M2003J15SS) or Redmi 9T They have a chip built in. Here's how to make sure you have one. NFC:

1. Check the box and documentation. The sticker or specification should say "NFC: Yes."
2. Look at the settings of the smartphone: Settings → Connection and Sharing → NFC. If there is no item, there is no module.
3. Use the AIDA64 app (available on Google Play). Open the "Dates" section and find the "NFC" line. If it's missing, there's no module.
4. Try downloading an NFC testing application (like NFC Tools) and if you run an error that says "NFC is not supported" the answer is obvious.

If you buy a Redmi 9 b/d, be sure to check with the seller for NFC. Some unscrupulous sellers remove mentions of the module in the description, when in fact it is not. Also pay attention to the region: in models for India (M2003J15SI), NFC is often absent, whereas in European versions (M2003J15SG) it is.

💡

If your Redmi 9 is not in NFC, But it is critical – consider buying an external one. NFC-adapter (e.g. Sonoff) NFC It connects through a 3.5mm connector and adds tag support, but won't allow you to pay for purchases.

How to Enable and Configure NFC on Xiaomi Redmi 9

If the NFC module is present in your Redmi 9, you need to activate it. By default, the function is disabled to save power.

1. Open Settings and go to Connect and Sharing.
2. Slip on NFC and move the slider to the "On" position.
3. Select the mode of operation: 💳 Card emulation – for payments (Google Pay, Mi Pay). 📱 Reading tags - for reading NFC-tag. 🔄 Data exchange – for transferring files (Android Beam).

For contactless payments, additionally set up the Google Pay or Mi Pay app (depending on the region).

Once activated, NFC will run in the background. To check its performance, hold the smartphone to another NFC device (such as a payment terminal or tag), an NFC icon or vibration should appear on the screen.

Check for the NFC module in the settings

Update your firmware to the latest version of MIUI

Install the Google Pay or Mi Pay app

Add your bank card to your wallet

Enable the option "Allow payments when blocked" (in the settings) NFC)-->

Note that in some MIUI firmware, the NFC may be located elsewhere, such as in Settings → Additional → Wireless Networks. If you don’t find an option, upgrade your smartphone to the latest version of the software.

The main ways to use NFC in Xiaomi Redmi 9

The NFC in Redmi 9 provides access to several useful features, and let’s look at the most popular scenarios:

1. Contactless payments

The most popular use of NFC is to pay for purchases with a smartphone.

1. Set up Google Pay or Mi Pay (in China).
2. Add a bank card (Mastercard, Visa, Mir are supported).
3. Bring Redmi 9 to the terminal at a distance of 2-5 cm.
4. Confirm the payment with a fingerprint or PIN-code (if required).

Advantage: no physical card is required, and downside: not all terminals support contactless payment (especially in smaller stores).

2. Data transmission between telephones

With NFC, you can quickly send a contact, a link, or a small file to another smartphone.

1. Turn on NFC on both devices.
2. Select a file or contact to transfer.
3. Hold the phones back to each other.
4. Wait for a sound signal or vibration.

Limit: The transfer speed is low (maximum 424 kbps), so it is better to use Wi-Fi Direct for larger files.

3.Reading NFC-marker

NFC tags are used in museums, exhibitions, smart homes, for example, you can program a tag to:

• 🔊 Turning on/off Wi-Fi or Bluetooth.
• 📱 Running a specific application (for example, a navigator when approaching a tag in the machine).
• 🔒 Opening of doors (if installed) NFC-castle).

To work with tags, install the NFC Tools app from Google Play.

4.Managing a smart home

If you have Xiaomi smart devices (like Yeelight lamps or Aqara sockets), NFC-So, tags can be used to automate, for example, a tag at the front door will turn on the light when you hold a smartphone.

💡

NFC in Redmi 9 does not replace Bluetooth or Wi-Fi — it is an addition for fast action over short distances.

NFC problems in Xiaomi Redmi 9 and their solution

Sometimes the NFC in Redmi 9 doesn't work properly, and here are the typical problems and ways to fix them:

⚠️ Attention: If NFC It stopped working after the update. MIUI, Try to roll back on the previous firmware version or wait for a patch from Xiaomi. Often bugs are fixed in the next updates.

• 🔄 NFC It doesn't turn on: Reboot your smartphone. If it doesn't work, reset your network settings (Settings) → System system → Resetting settings → Resetting network settings).
• 💳 Payments don't work: Make sure a bank card is added to Google Pay and supports contactless payments.Some banks are blocking NFC-default.
• 📵 Smartphone doesn't see tag: Make sure the tag isn't damaged. Try another tag or reinstall the reading app.
• 🔋 NFC Battery discharges quickly: This is impossible - the module only consumes energy when used actively. If the battery goes down quickly, look for the problem in another (e.g., in the background app).

If nothing helps, check the integrity. NFC-It's located under the top of the smartphone, and it can get damaged by falling or disassembling, and it'll need repairs at the service center.

NFC Security: Myths and Reality

Many users fear that NFC can be hacked or that data will be intercepted.

• 🔒 Myth 1: NFC Reality: to intercept data, an attacker needs to be less than 10 cm from your smartphone at the time of the transaction, which makes an attack extremely unlikely.
• 💳 Myth 2: Payments through NFC The reality is that every payment is confirmed by a unique token (a virtual card number), and the real card number is not transmitted, and even if the data is intercepted, it cannot be reused.
• 📱 Myth 3: NFC Reality: Payment requires unlocking the screen and confirmation (fingerprint or fingerprint) PIN). Accidental write-offs are impossible.

However, follow simple safety rules:

• Do not store multiple card data on your smartphone unless you use them regularly.
• Turn off NFC when it is not needed (for example, on public transport).
• Use only official payment applications (Google Pay, Mi Pay).

⚠️ In some countries (for example, in Russia) banks may be blocked NFC-Payment via Google Pay for cards issued overseas. check this point with your bank before setting up.

FAQ: Frequent questions about NFC in Xiaomi Redmi 9