Modern smartphones have long since ceased to be just devices for calls, becoming universal tools for everyday life. Xiaomi Redmi 9C, despite its affordable cost, offers users a wide range of functionality, including support for NFC (Near Field Communication) technology, which allows you to share data over short distances, pay for purchases in stores with a single touch and quickly connect to other gadgets without complex settings.
However, many budget model owners have difficulty getting to know the module for the first time, and users often don’t even know that their device has the right chip, or they don’t know how to activate hidden system functions. In this article, we’ll take a look at how to check for the module, set it up correctly, and use all the contactless features in your Redmi 9C.
Understanding the principles of contactless communication will help you not only simplify your everyday tasks, but also protect your data. We will look at the nuances of working with payment systems, file transfer and automation that is available thanks to this standard.
Verification of availability and activation of the NFC module
The first step before using any wireless data features is to make sure that the hardware is available. Although the Redmi 9C model is equipped with an NFC module in most global versions, there are regional variations where this component may be missing or software-disabled. First, you need to visually inspect the device case or smartphone box: the presence of the NFC logo usually indicates support for the technology.
If there are no externals, you should go to the system's software settings. Go to the Settings menu, then select Connect and Sharing. This is where the main switch that activates the chip is located. If you don't find one, try searching by settings by entering the acronym NFC. The lack of a search result may indicate that your particular phone modification doesn't have this module installed.
You can use the control panel to activate quickly. Swipe down from the top edge of the screen to open the notification curtain. Find an icon that resembles the letter N or the contactless logo and tap it. If the icon is not in the visible part of the panel, click on a pencil or three dots to edit the quick access buttons and add the desired item to the desktop.
⚠️ Attention: In some firmware MIUI activation of the module requires reconfirmation of actions for security purposes, if the system requests permission to access the geoposition when activated NFC, This is normal, as some services use both modules to accurately determine the location.
After turning on the phone, it is recommended to perform a short diagnostic. Bring the device to any bank card with a chip or a ticket. If the phone emits a characteristic beep or a notification about the detected tag appears on the screen, then the hardware is healthy and ready to go, otherwise it is worth checking the system updates or contacting the service center.
Google Pay and Contactless Payment
One of the most popular features for Xiaomi owners is the ability to pay for purchases in stores by attaching the phone to the terminal. To implement this feature, the Redmi 9C uses Google Pay (or its current counterpart Google Wallet), the setup process requires care, since the security of financial transactions is the first place.
First, make sure that the device has an official Google Play Market app store and is logged in to your account. Download the payment system app if it is not pre-installed. After you start the program, you need to add a bank card. This can be done in two ways: scanning the card with the smartphone camera or manually entering the data.
Manual data entry requires special care. You will need a card number, expiration date, CVC-The code and the name of the holder, and after entering the data, the bank will send it SMS-Verification code. Enter the resulting code into the appropriate application field.
☑️ Checklist for setting up payment
There is an important caveat for Xiaomi users with global firmware: Sometimes security can block payment applications if it detects them. ROOT-rights or modified system. in normal Redmi mode 9C It works without problems, but if you have installed third-party launchers or performed deep customization, there may be errors in payment.
⚠️ Note: Never pass a confirmation code from SMS to outsiders, even if the caller is an employee of a bank or Google support team.
When the card is successfully added, you can use your smartphone to pay. Just unlock the device and hold it up to the terminal. You don't have to open the app every time, it's enough to keep the phone active. The system will pick the card and make the transaction in seconds.
File transfer and data exchange between devices
Apart from payment, the NFC technology in Redmi 9C is great for fast file transfers, and although the NFC protocol itself has a low data rate, it is ideal for instantaneous connection between devices, after which files are transferred over a faster channel, such as Bluetooth or Wi-Fi Direct.
To transfer a photo, contact, or link to another phone, make sure that both devices are enabled with Bluetooth and NFC. Open the file you want to send, such as an image in a gallery. Click on the "Share" button and select the method of transferring "Android Beam" or "Share via NFC." Hold the backs of your smartphones close to each other.
The devices should be no more than 2-4 centimeters away. When the connection is established, you will feel a slight vibration, and a request for confirmation of the transmission will appear on the screen. Once confirmed, the data copying process will begin. The speed will depend on the file size and the Bluetooth version, but the initial handshake is instantaneous thanks to NFC.
Why can't the transfer start?
This method is particularly convenient for exchanging contacts. Instead of dictating a phone number or searching for an app for a messenger, you can simply touch the phones. Contacts are saved to the address book of the receiving party automatically or with minimal user confirmation. This saves time and eliminates errors when manually entering numbers.
It’s worth noting that for transferring large amounts of data, such as video to 4K or archives with games, it’s better to use a direct Wi-Fi connection or cable, since even with NFC to start, Bluetooth limits can be a bottleneck.
Using NFC to Automate Tasks
Owners of Xiaomi Redmi 9C may be used NFC-tags to automate routine activities. Special programmable tags (NFC Tags are inexpensive and allow you to run complex scenarios with one touch of the phone to the tag, which turns the smartphone into a control center for a smart home or personal assistant.
To work with tags, you need to download a special application, such as NFC Tools, or use the built-in automation features in MIUI. You can write a label to turn on Wi-Fi when you come home, or a command to "Do not disturb" when you put your phone on the bedside table at night. The possibilities are limited only by your imagination.
Let’s look at popular use cases:
- 🚗 Car: Put a tag on the phone holder. When you touch it, the phone automatically turns on Bluetooth, starts the navigator and turns on music playback.
- 🏠 Home: The tag at the entrance can turn off mobile data and turn on Wi-Fi, saving battery power.
- 💤 Sleep: The label on the nightstand puts the phone in the “Flight” mode, the alarm is set at 7:00, and the brightness of the screen is reduced to a minimum.
Configuring scenarios in MIUI It allows you to create chains of action. You can program the tag to send it. SMS-A message to Mom contact with the text "I'm at home" when you touch the tag at the front door, which is especially useful in situations where your hands are busy or you need to quickly report your location.
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Buy rewritables NFC-marker NTAG215. They allow you to change tasks many times, which is convenient for experimenting with automation without buying new chips.
Comparison of transmission and connection methods
To better understand the place of NFC in the Redmi 9C connectivity ecosystem, it’s useful to compare it to other wireless technologies. Each has its own advantages and limitations, and knowing these differences will help manage your phone’s resources effectively.
Unlike Bluetooth, NFC does not require a pairing procedure with code entry or confirmation of device lists. The connection is instantaneously established on physical contact or close proximity. However, the range of NFC is extremely small, only a few centimeters, while Bluetooth operates at distances of up to 10 meters or more.
The table below shows the key differences between the technologies available on your smartphone:
| Characteristics | NFC | Bluetooth | Wi-Fi Direct |
|---|---|---|---|
| Radio of action | 10cm | up to 10-50 m | 200m |
| Transmission speed | Low (424 kbps) | Medium (up to 3 Mbps) | High (up to 250 Mbps) |
| Energy consumption | Minimum | Average. | High. |
| Time to connect | Instantly (< 0.1 sec) | A few seconds. | A few seconds. |
The table shows that NFC is not designed to transfer heavy files directly, but is the perfect tool for initiating a connection. Wi-Fi Direct is good for transferring gigabytes of data, but requires more energy and time to set up. Combining these technologies at Xiaomi allows you to achieve an optimal balance between speed and convenience.
Also worth mentioning is the power consumption. The ever-on NFC module consumes a negligible amount of Redmi 9C battery power. So there's no point turning it off every time you don't use the payment. The difference in autonomy will be subtle, and the convenience of instant access to features is worth it.
Solving and diagnosing problems
Despite the reliability of the technology, Redmi 9C users may experience a variety of problems when using NFC, most often due to software failures, interference from cases or incorrect security settings.
One of the common problems is that you can't pay. The terminal may not see the phone or the payment won't go through. First of all, check if Google Pay is the primary payment method in the NFC settings. Also make sure the date and time on the phone are set correctly - time desynchronization often blocks secure connections with banks.
If the phone has stopped reading tags or cards, perhaps the intervention is made by a case. Thick protective cases, especially those containing metal elements or magnetic latches, can shield the signal. Remove the case and try to repeat the operation. If the problem is gone, consider replacing the accessory with a thinner or specialized one.
⚠️ Warning: If the phone is heated in the camera area when used NFC, This could be a sign of a module malfunction or a short circuit.
In case of software errors, resetting network settings helps. Go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. Note that this action will remove stored Wi-Fi passwords and conjugated Bluetooth devices, but often solves problems with hanging communication modules.
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Most NFC problems are solved by restarting the device, removing the case, or checking the date and time in the system.
Another cause of failures can be third-party applications that conflict with system services. If problems began after installing new software, try to remove it and check the module. Also, do not forget about the banal contamination of the back of the phone - greasy stains or dirt can worsen contact.