How to know how old your Xiaomi phone is: all ways to check your age

IMEI Registered in the operator database only at the first inclusion SIM-If the phone was in stock or sold without activation, it can be as much as a year. 9A, The product, which was produced in December 2020, could only be activated in March 2021. 3. MIUI: Hidden information about the phone firmware MIUI It contains hidden engineering menus where you can find build date, first turn on time, and even the number of reboots. These codes work on all Xiaomi phones, but you need to be careful - do not change the settings in these menus: 📅 ##4636## - Test menu, where the phone information section can display the date of the first OS boot. 🔧 ##284## - Equipment test, which sometimes indicates battery life (indirect indication of age). 📡 ##6484## — menu MTK Engineer Mode (for phones running a MediaTek processor) where in Hardware Testing → Version can be a firmware date. An example of decrypting data from an engineering menu: Build Date: 2021-05-15 14:30:00 First Boot Time: 1621084800 (Unix timestamp: Here, First Boot Time is the date the phone first turned on in Unix format. To make it look normal, use sites like this. [epochconverter.com](https://www.epochconverter.com/). 4. Check through the official Xiaomi website (for authorized devices) If your phone is linked to a Mi Account, you can find out the date of the first activation through the official Xiaomi service. IMEI, Because the data is taken directly from the manufacturer's database. [account.xiaomi.com](https://account.xiaomi.com/) and log in. Select the Devices section). Find your phone in the list and click on it. Scroll down to the Device Information block, and it will have the activation date line. Method limitations: ❌ It does not work for phones purchased without an account link (for example, in the gray market). ❌ Shows the date of first reference to the Mi Account, not the production. ✅ Suitable for authenticating the phone (original vs fake). 💡The activation date in the Mi Account may be 1-12 months later than the production date, for example, the phone could be in stock or sold without first setting. 5. If no other methods have helped, assess the state of the battery - this is the most reliable "biomarker" of the phone. MIUI Diagnostics of the battery that show its real capacity and the number of charging cycles. How to check wear: Go to Settings → Battery and performance → Battery status. See Capacity parameter (e.g., Capacity, 3800 mach 4000 Calculate the wear and tear: (4000 – 3800) / 4000 × 100% = 5%. Approximate table of wear and age correspondence: Battery wear Approximate age of phone Recommendations 0–10% 0–1 The battery is in excellent condition. 10–25% 1–2 Start monitoring the time of autonomy 25–40% 2–3 Replacement of the battery in the service 40%+ 3+ Critical wear and tear - the phone can turn off when 30–40% charge ⚠️ Warning: Rapid wear of the battery (more) 20% a year) may indicate a non-original battery or operation in extreme conditions (constant charging up to 100% high-temperature). 6. Load number check (for new phones) If you buy a Xiaomi phone from an official store or dealer, the batch number may be listed on the box or in documents, which consists of letters and numbers, which often encrypts the date of production: 📦 2108XM567 — August 2021 year-end. 📦 XM-C22-1234 — March 2022 year (C) = 3-month). 📦 202011_POCO — November 2020 Where to look for the batch number: The box sticker next to the barcode, the warranty card (if you bought it in the official store), the check or the bill of lading (for wholesale lots), the batch number often indicates the date of shipment of the phones from the factory, not their assembly. 1–3 For example, a Redmi Note batch. 11 marked "2201" could have been assembled in December 2021, but shipped in January 2022. Frequent errors and how to avoid them Many users encounter inaccurate data when checking the age of the phone. Here are the most common errors and ways to correct them: 1: The serial number does not contain a date. 🔹 Reason: The phone is released for the Chinese market or is rebranded (e.g., a rebrand, POCO X3 = Redmi K30S). 🔹 Solution: Use IMEI Or engineering codes. 2: Date to IMEI It doesn't match the real thing. 🔹 Reason: IMEI It may have been changed (for example, after the motherboard was repaired). 🔹 Solution: Check the originality IMEI service [imei.info](https://www.imei.info/check/imei-number-valid). Mistake. 3: Engineering menu not open. 🔹 Reason: The phone is custom firmware or disabled developer rights. 🔹 Solution: Enable Developer Mode (7 once you click on the version MIUI customized). FAQ: Can you find out the age of a Xiaomi phone without a box and documents? IMEI (code *#06#) service codes MIUI. Also check the battery status, which is an indirect but reliable indication: If the phone is tied to the Mi Account, you can see the activation date in your personal account. Why are the production date and activation date different by six months? That's fine. The phone could be in stock at the manufacturer, dealer or store. For example, many Xiaomi models are manufactured in advance (for example, by Black Friday), but only activate after purchase. How to check if the motherboard (and with it the date of production) has changed? IMEI on the box and on the phone (code #06#). If they're different, the fees change (##4636##*) Check out the Baseband version – if it doesn’t match the model, it’s a sign of repair. Can you tell by the age of the phone how long it will last? The approximate lifespan depends on the model: Budget phones (Redmi) 9A, POCO M3): 2–3 The year in active use. mid-segment (Redmi Note) 11, POCO X4): 3–4 Flagships (Xiaomi) 12/13/14): 4–5 The best components in the years, key factors: battery status, support for updates MIUI Where can I officially check Xiaomi phone history by serial number? Xiaomi does not provide a public service to check history by serial number. However, you can: Contact the official service center with a check and a box. Use third-party services like [SNKtoOL](https://snktool.com/) (fee, ~$5). Check the binding to Mi Account – there is a date of first activation.