Buying a smartphone online is always a lottery, where the chances of getting a great gadget, as well as a restored or openly defective copy are high, especially for the popular brand Xiaomi, whose devices are often the object of counterfeiting or returned to sale after hidden repairs. Ignoring the initial diagnosis can lead to the fact that you will find problems after the return period expires.
The market today is oversaturated with models, from the Redmi budget series to the flagship Black Shark, and each requires careful inspection. You won’t be able to physically touch the device before payment, so your main task is to analyze visual data, documentation and software as thoroughly as possible immediately after unpacking. Careful inspection takes no more than 15-20 minutes, but saves you from months of frustration.
In this article, we will discuss the specific steps to take when taking a courier or opening a box at home, and we will not rely on luck, but rather on built-in engineering tools and logical analysis of external signs. It is critical to conduct all the tests before you start synchronizing your personal data and accounts.
Visual inspection of packaging and configuration
The first thing you get your hands on is the box. Xiaomi packaging is always good, it's dense, it's clear, it doesn't smear paint, it has to have a sticker at the bottom of the package that has IMEI, serial number, and model of the device, and it has to match the ones on the warranty card and the check.
When you open the box, you notice the location of the accessories. SIM-The cards and documentation should lie flat, without traces of use. The smartphone itself must be in a protective matte film with the brand logo or the inscription Mi. If the film is glued curved, has bubbles or is not at all - this is the first alarm signal.
- 📦 Packages must be free from opening, denting or bruising on the edges.
- 🔌 Charger must correspond to the region of sale (European plug for RF/CIS).
- 📄 The complete must necessarily be a warranty card with the seller's seal.
⚠️ Warning: If the box contains additional store stickers over the factory barcodes, carefully check if they are hiding information about re-sealing or changing the regional version.
Don't be lazy to compare the weight of the device to the specifications. A difference of even 5-10 grams may indicate a replacement battery or the absence of some internal components. Use a kitchen scale for accuracy if there are no professional ones at hand.
Checking external defects of the body and screen
The most important step is to inspect the gadget in good lighting, swipe all sides of the case, and the new device should be free of chipping, scratching, gaps between the frame and glass, or button backlashes. Pay special attention to the USB-C charging port: there should be no dust or scratches from multiple cable connections.
The screen is the most fragile and expensive element. Turn on the device and set maximum brightness. You can see broken pixels, irregular backlights or yellow spots on a white background. You can see the lights on the edges of the matrix on a black background in a dark room, which is characteristic of the matrix. IPS-Redmi screens, but should not be too obvious.
☑️ Checklist of appearance
Check the tactile response and the oleophobic coating. Swipe your finger over the screen, it should slide easily, without feeling "rough." If the finger is struggling, maybe the factory forgot to coat or, worse, the screen has already been changed to a cheap one.
IMEI verification and device authentication
Make sure that you are not a clone, but the original product, will help to check the unique identifier. type on the phone keyboard command *#06#. IMEI slot-in SIM-These numbers should be one-on-one with those printed on the box and on the system menu.
Next, go to Settings → About Phone → General Information. You can find the "Certification" button or the ability to check the status of the device through the official Mi Verify website. Enter the serial number and IMEI in the search box on the manufacturer's website. The system must confirm that the device is original and is sold legally.
| Parameter | Where to find out | Normal value. |
|---|---|---|
| IMEI 1 | *#06# / The box | Full coincidence of numbers |
| Serial number. | Settings/Box | It matches all carriers. |
| Mi Account Status | Settings → Mi Account | "Log in" (account clear) |
| MIUI version | Settings → About the phone | current or close to it |
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If the menu does not open when you enter the *#06# code or the numbers are displayed incorrectly (for example, all zeros), you are facing a possible fake or device with a re-seeded motherboard.
Also check if the phone is linked to someone else's Mi Cloud account. When you first turn on, the device must not require a password from the previous owner. Having an activation lock means that the phone may have been stolen or lost and you will not be able to use it fully.
Diagnostics of the hardware through the engineering menu
Hidden in the shell of MIUI and HyperOS is a powerful self-diagnosis tool, and to get into it, type ##64663## (or #6484## for some models), and the CIT (Customer Information Test) menu will open, which lists all the components of the smartphone.
Go through the test list. Check the vibrator motor, all the microphones (you need to talk in them and listen to the recording), speaker, proximity sensor and accelerometer. Pay special attention to the touch screen test: swipe through all the cells of the grid to make sure that the multi-touch works throughout the screen area without dead zones.
Checking the cameras in this menu allows you to assess the focusing and the presence of dust under the lenses. Take a few pictures in different modes, including macro and portrait. If the focus is "walking" or the picture is cloudy, it may be that the camera module is damaged or unoriginal.
⚠️ Warning: Don't ignore the proximity sensor test.If it's faulty, the screen won't go out during the conversation, leading to accidental cheek presses and call resets.
Battery analysis and performance test
The battery state is a hidden parameter that you don't always see right away. There's often a "Battery info" item on the engineering menu where you can see the number of recharge cycles. For a new device, this value should be close to zero or one. If there are dozens of cycles, the phone was definitely in use.
To test the real performance and stability of the processor under load, use benchmarks such as AnTuTu or Geekbench. Run the test and observe the behavior of the system. Sharp drops in fps, interface freezes or extreme housing heating (more than 45-50 degrees) indicate problems with thermopast or chip degradation.
Settings → About Phone → Processor (click 5-7 times)This hidden command (not working on all versions) or third-party apps like CPU-Z will help you find out the real hardware. Compare the name of the processor, frequency and number of cores with the official specifications of your Xiaomi model.
Why is the new phone warming up?
Checking communications, Wi-Fi and GPS-module
The functionality of the communication modules is critical. SIM-You can check the signal level, try to make an incoming and outgoing call, send it. SMS. Make sure that the Internet is working through a mobile network (LTE/4G/5G).
To check Wi-Fi, connect to your network and run heavy video in high resolution. Communication interruptions or low speeds can indicate an antenna module. GPS is checked by launching maps (Google Maps or Yandex.Maps) and turning on geolocation: satellites must be determined in 10-20 seconds in open space.
- 📡 Check Bluetooth by connecting wireless headphones.
- 📍 precision GPS important for navigation and taxi/delivery.
- 📞 The volume of the interlocutor should be clear, without wheezing and interference.
If the phone supports NFC, check it by trying to count any bank card or travel card.A lack of response can mean an NFC antenna malfunction, which is often found after poor-quality repairs to the case.
Frequent questions when accepting a smartphone
What if the IMEI on the phone and the box don’t match?
Can I check my phone for water protection myself?
Is it okay if the phone comes with a charge of 40-60%?
How to distinguish the Chinese version from the Chinese version?
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Main result: Do not sign the act of acceptance and transfer and do not confirm receipt of goods in the marketplace application until you have carried out at least a basic visual check and IMEI check.
Compliance with these rules will allow you to avoid buying illiquid goods and keep your nerves. Remember that the law is on your side only at the time before confirmation of receipt, so use this time as efficiently as possible.