How to check the used phone Xiaomi when buying: a step-by-step guide with photos and videos

Buying a used Xiaomi smartphone is a great way to save money, but without careful verification, the risk of running into a “cat in a bag” is extremely high. According to statistics from 2026, one in three used Redmi or a single smartphone is a “cat in a bag”. POCO In the aftermarket, there are hidden defects ranging from a replaced battery to software locks after theft, and this article will help you avoid typical errors and check your phone against 15 key parameters, including tests that are not reported by sellers.

We will analyze not only basic checks (appearance, sensor, cameras), but also hidden threats: how to identify “gray” imports, check the history of repairs through the Internet. IMEI, detecting the switching of components and even determining whether the phone was in the water for indirect reasons. 2022–2026 years (Redmi Note) 12 Pro+, Xiaomi 13T, POCO F5 etc.) taking into account the specifics of MIUI 14/15.

Importantly, if the seller refuses to even one checkpoint, it's a reason to be wary. FAQ answers to complex questions (such as how to check your phone if it is unlocked but not activated) and a table of typical “traps” with photo examples.

1. Originality Check: How to distinguish a fake from a real Xiaomi

The first and most critical step is to verify the originality of the device, and fakes under Xiaomi are found even in large marketplaces, not to mention hand-held.

• 🔍 Logo: Original logo is convex (on models up to 2022) or laser (on new models), not a sticker.
• 📦 The box: official devices have a dense, clear seal and hologram, often missing a barcode or blurred on fakes.
• 🔧 Fonts and inscriptions: on the original Xiaomi, the inscriptions on the body (for example, “Designed by Xiaomi”) are made neatly, without shifting the letters.
• 📱 Firmware: Fakes often run on customized Android without MIUI. Check in Settings → The phone.

The most reliable way is to check the IMEI. For that:

1. Dial on the phone keyboard *#06# and the 15-digit code will appear.
2. Compare it to the IMEI on the box and under the battery (if removable).
3. Check it out. IMEI IMEI.info – the model and status of “Clean” must match (not blacklisted).

The photo below shows a fake Redmi Note 10 Pro. Notice the curved font of the logo, the absence of a hologram on the box and the unoriginal firmware (instead of the original firmware). MIUI It's a shell from another brand).

⚠️ Note: if the seller claims that the phone is “brought from China” and therefore without a box is a sure sign of “gray” imports, such devices often do not pass certification in Russia and may have problems with warranty or work in local networks (for example, do not catch). 4G operator).

External inspection: what the drowned person or the broken phone gives

Even if the phone looks perfect, the defects can hide under the body, and do the inspection in good lighting, preferably under a magnifier.

• 🔦 Screen: Check for burns (spots from long-term static displays), scratches and microcracks. Turn on white to full brightness - the defects will be more noticeable.
• 💧 Moisture traces: inspect the connectors (USB-C, 3.5 mm, tray SIM) If you have white plaque or green spots, it's a sign of water coming in.
• 🔨 Body: Check for the gaps between the body and the screen, and if they're not even, the phone falls or disassembles.
• 🎨 Paint: on the original Xiaomi, paint doesn't wear off or peel off. Rub the body with a napkin - if there are traces left, it's a replica.

Pay special attention to the Liquid Damage Indicator, LDI). He's here:

• Under the lid SIM-tray (red or white dot).
• Under the battery (on models with a removable battery).

If the indicator turned red or turned purple, the phone would contact the water, even if the seller claimed otherwise.

3. Battery testing: how to find out the real wear

The battery is the most consumable component of a smartphone, and even if the phone lasted a year, it could have dropped 20 to 30 percent in capacity, and vendors often reset their charging cycle counters, but there are ways to spot the cheating.

Method 1: Through the engineering menu (works on most Xiaomi models):

1. Open the Phone app and dial ##4636##.
2. Select Battery Information.
3. Look at the wear level (if any) or capacity setting. Compare it to the passport capacity of the model.

Method 2: Through the AccuBattery app (download from the Play Market):

• Install and charge your phone to 100%.
• In the Health section, the application will show the real capacity in mAh.
• If the difference is with the passport capacity >15%, battery worn out.

Notice the bloating of the battery: put the phone on a flat surface and spin it. If it swings or the screen moves away from the body, the battery swells. It's dangerous: it can damage the motherboard or even ignite.

⚠️ Warning: If the seller says the battery has just been replaced, ask for a check from the service center. Without the document, it can be a cheap analogue with a capacity 2-3 times lower than the original. For example, instead of 5,000 mAh, you will be given 2,500 mAh, and the phone will run out in 3-4 hours.

4. Performance check: sensor, speakers, cameras and network

Now, let's move on to functional tests, and use built-in tools or third-party apps like Phone Check and Test.

📱 Touch screen

Check it out.

• 🖍️ Multi-touch: Open the multi-touch test and swipe the screen with 5-10 fingers. All lines should move smoothly.
• 🔄 «Dead Zones: in Settings → Display. → Colors and style, turn on Black and White mode. Swipe your finger all over the screen, and if there's a break in the trail, it's a defect.
• 🔥 «Hot pixels: open the black image to full brightness. If you have colored dots, they're broken pixels.

🔊 Speakers and microphone

Test this way:

• 🎵 Turn on the music at maximum volume – there should be no wheezing or distortion.
• 📞 Call another phone and check how your voice is heard (sometimes the microphone works but the sound is jammed).
• 🔇 Check the speaker: during the call press the phone to your ear - the sound should be clear, without crackling.

📸 Cameras

Take a photo in different conditions:

• 🌞 In bright light: check for detail and lack of artifacts.
• 🌃 In the dark: turn on night mode. If the photos are blurry, there is a problem with the module or firmware.
• 🔍 Mac: Take a picture of the fine text, if the camera isn't focusing, maybe the lens is damaged.
• 🎥 Video: Record a motion video. A shaking or twitching image indicates a stabilization malfunction.

📶 Network and communication

Check it out.

• 📶 4G/5G: insert SIM-Check the speed of the internet at Speedtest. 10 Mbit / s - possible problems with the modem.
• 📡 Wi-Fi and Bluetooth: connect to the network and transfer the file. If the speed is below 1 MB / s or communication is interrupted, the antenna problem is not available.
• 📍 GPS: Open Google Maps and check the accuracy of the location. If the coordinates jump, the module. GPS faulty.

💡

If the phone doesn't catch the network, but the seller says it just didn't insert SIM», Try inserting your card. Sometimes the fault is masked by disabling network search in the settings (Settings) → SIM-maps and mobile networks → Searching the net).

5. Lock check: how to know if a phone is stolen

One of the most unpleasant surprises is buying a phone that is blacklisted (lost/stolen). IMEI web-based:

• 🔗 SND Deep Info (shows the blocking status in Russia).
• 🔗 IMEI.info (international base).
• 🔗 CheckMendeley (Lost/Theft Check).

If the phone is locked, you will see the following statuses:

• Blacklisted - Blacklisted (cannot be activated)
• Lost/Stolen — stolen or lost.
• Clean - clean (you can buy it).

Also check if the phone is linked to your Mi Account.

1. Go to Settings → Accounts → Mi Account.
2. If there is someone else’s account, ask the seller to log out before you buy.
3. After exit, restart the phone – if a request for a password appears, the phone is tied to the account (the risk of locking after reset).

💡

If the phone requires a password from Mi Account after reset, it can only be unlocked through the official Xiaomi service (cost). ~3000–5000₽). Without unlocking the device will become a “brick».

⚠️ Note: Some sellers claim to "know the password" from the Mi Account, but after buying it, it may turn out that the account is linked to another number or email!

6.Diagnostics of "iron": how to check the processor, memory and sensors

For a deep check of “iron” use applications AIDA64 or CPU Throttling Test. They'll show:

• 🖥️ Processor: the model must match the stated (for example, Snapdragon 8 Gen 2 for Xiaomi 13 Pro.
• 💾 Memory: check the type (UFS 2.2/3.1) Sometimes the sellers point to the volume. 256 GB, in fact — 128 GB.
• 🌡️ Trottling: Run the test in CPU Throttling Test: If performance drops by more than 30%, the processor overheats or wears out.
• 🔄 Sensors: Open up. AIDA64 → Sensors. All parameters (accelerometer, gyroscope, compass) must display data.

Pay attention to the temperature of the processor:

• In plain: up to 40°C.
• Under load (games, tests): up to 70-80°C.
• If the temperature is above 90°C – Problem with heatpast or cooling.

Also check the internal memory for broken sectors:

1. Install DiskDigger.
2. Run a deep scan.
3. If there are unreadable files, the memory is worn out.

7. Verification of the history of repairs and originality of components

If the phone is repaired, it's not always bad, but it's important to use original parts.

• 🔧 Through IMEI: IMEI.info's Warranty section sometimes displays repair history.
• 📱 Through service tags: original Xiaomi parts have laser engravings with a serial number. For example, the battery must have a sticker with a serial number. QR-code.
• 🔍 Visual: Screen: original is oleophobic (water drops roll). No coating on fakes. Camera: original module is clearly labeled (e.g. Sony) IMX708 Xiaomi 12T Pro).

If the seller says, "The screen has been changed in the service," ask for a document, and without it, it's likely that a cheap analogue with poor color reproduction or sensor is delivered.

Final check: 1-2 hour test and negotiations with the seller

Even if you pass all the tests, don't rush to give the money away.

• 🕒 Leave your phone for 1-2 hours for a long test (during which time you may experience problems with overheating or battery life).
• 📄 Provide a check or warranty card (if the phone is guaranteed).
• 🔄 Make a reset to the factory settings with you (Settings) → The phone. → Resetting settings).

During the test:

• Play a heavy game (such as Genshin Impact) to check for overheating.
• Take a video in 4K — camera-check.
• Charge your phone to 100% and see how fast it discharges.

If the seller refuses a long test or reset, it is a reason to doubt the integrity.

• 🚩 He is in a hurry to buy.
• 🚩 Refusing to show the box or documents.
• 🚩 Says "the phone is new but without a box" (often sold as stolen devices).

💡

If the seller requests payment by transfer to the card or through QIWI/Wallet — it 100% The best option is cash at a meeting or a secure transaction through the marketplace (Avito, Yula).

FAQ: Answers to difficult questions