Xiaomi, Redmi and POCO are known for their excellent value for money, but their performance can decline over time. Often users wonder about the real age of the device, especially when buying a used gadget or assessing the state of the battery. The life of the phone is not only the time from the moment of inclusion, but also a comprehensive measure of wear and tear of internal components.
Unlike the iPhone, where the activation date is checked through Apple's website, the Android ecosystem is a little more complicated, there's no single "How old am I?" button, but there are many indirect and direct ways to get that information, and knowing the exact date of production helps you know if you've got a warehouse copy that's been on the shelf for several years.
In this article, we will look at all available methods, from simple codes in the call to deep diagnostics through the computer, you will learn to determine the age of the device, check the battery recharge cycles and identify possible firmware manipulations that hide the real mileage of the gadget.
Use of the engineering menu and USSD-code
The fastest way to get technical information about your device is by using hidden codes. Type ##4636## in the Phone app. If the menu opens, go to Usage Statistics or Statistics, which shows the time since the first operating system boot.
But this method doesn't show the date of production, it shows the time of the current firmware, so if the phone was reset to the factory settings, the meter zeroed out. For a deeper diagnosis, you can try the code ##6484##, which opens the phone. CIT-menu (CIT Test) In some versions MIUI In the "Version" or "About" section, the date of the software assembly may be indicated.
⚠️ Warning: Codes may not work on global firmware versions or may be blocked by the carrier. Do not change the settings in the engineering menu unless you know exactly what the parameter is responsible for.
Another useful code is ##8351##, which includes the log mode (Voice Recorder), but it rarely contains date information. The more effective code ##225#, which shows calendar information, is also not always an exact activation date, so the codes should be considered as the primary, but not the final, source of data.
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If the codes don’t work, try installing the Phone Info app from Google Play – it can often read hidden system logs where a standard caller is powerless.
Checking dates through Mi Account and service site
The most reliable source of information is the official website of Xiaomi. the company stores data on the date of the first activation of the device in its database. IMEI-code that can be found on the box, under the battery (if removable) or by entering *#06# in the dialer.
Go to Xiaomi's official authentication site. Type in IMEI and CAPTCHA. The system will give you device status and, most importantly, first activation date. This is the official start of the phone's lifespan. If the date matches the purchase date, that's fine. If the phone is activated months before purchase, it could be a showcase or a refurbished device.
You can also find information on your Mi Cloud account. Go to i.mi.com. Devices often displays a list of attached gadgets with an approximate date of first sync, which is not always an exact activation date, but a good guide to understanding the age of the device.
Analysis of system logs and compilation time
For advanced users, there is a method of analyzing system files. The firmware compilation date always precedes the activation date of the phone. If you see that the firmware is assembled in 2021 and the phone is supposedly new in 2023, this is a reason to be wary.
To find out the build date, go to Settings → About the phone. Find the line "Version." MIUI» And press it. 7-10 Once you have the message "You've become a developer" and then go back to Settings. → Advanced settings → For developers, find the item "Debugging by USB» and turn it on.
Now connect the phone to your computer. Using the Android Debug Bridge (ADB), you can execute a command to get the system properties:
adb shell getprop ro.build.dateThis command will return the build date of the current firmware installed. It won't tell you when the phone was first turned on, but it will tell you how old the software shell is. If the phone is new and the build is very old, it may have been in storage for a long time or re-stitched.
What is ADB?
Diagnosis of battery status
The life of a phone is closely linked to the health of its battery: Lithium-ion batteries age even without use, but active charging-discharge cycles wear them out faster. MIUI There is a hidden battery diagnostics menu available through CIT-code ##6485##.
In the menu, find the parameters:
- 🔋 MB_06: Battery health status (Good/Bad).
- 🔋 MB_00: Percentage of current charge.
- 🔋 MF_02 (or MF_05/06 In different versions: Number of recharge cycles.
- 🔋 MF_05: Residual battery capacity (in mAh).
Charge Cycles is the key. One cycle is the full discharge and charge from the 0 before 100%. If the phone is a year, but the cycles are already 500, So it's been exploited very actively, and by comparison, a year of moderate use usually gets a lot of swelling. 250-300 cycle.
⚠️ Note: Some new models with fast charging HyperCharge parameters MF_05 and MF_06 may be displayed as 0 or not displayed at all due to the limitations of the power controller.
Use of third-party applications
If the built-in tools don't give you the full picture, Google Play apps come to the rescue, they can read hidden logs and provide information in a convenient way, and one of the most popular is Phone Info (developer vndnguyen).
The annex shows:
- 📱 Exact model and region of the device.
- 📅 Date of production (if available in the system).
- 🔋 Battery health and number of cycles.
- 📡 Information about the touch screen and camera.
Another powerful tool is Device Info HW. It provides detailed hardware data, including the date of first application installation (sometimes it helps to indirectly determine age), but remember that applications only see what the system allows them to. If the firmware is modified, the data can be distorted.
☑️ Checking the used phone
Table: Comparison of verification methods
To make it easier for you to navigate, we've put the basic methods in a comparative table, and each method has its pros and cons, depending on the model and version of MIUI.
| Method | Accuracy of date | I need a PC. | Difficulty |
|---|---|---|---|
| Official Xiaomi website | High (activation) | No. | Low. |
| Code ##4636## | Medium (reset) | No. | Low. |
| CIT Menu (#6485###) | High (cycles) | No. | Medium |
| ADB Teams | High (assembly) | Yes. | Tall. |
| Applications (Phone Info) | Medium | No. | Low. |
Visual inspection and indirect signs
Sometimes software is powerless, and a physical examination comes into play, and the phone's life leaves traces on the case, and notice the USB-C charging connector. If the contacts are darkened and the backlash is large, the phone has been used extensively and for a long time.
Also, look at the oleophobic screen covering. On new devices, the finger slides easily, the greasy spots wear off quickly. On gadgets older than 1.5-2 years, the coating often wears off in the center of the screen, and the fat begins to eat into the matrix. The scuffs around the on button or fingerprint scanner also give off age.
It's important to check the screws on the bottom end. If there's a screwdriver on the screwdriver, the phone was opened, it could be for battery replacement (which is good) or for repairs after a fall (which is risky), the original factory assembly usually has no trace of interference, except for microscopic scratches from transportation.
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The combination of the activation date software check and the physical wear of the connector gives the most complete picture of the actual age of the device.