How to know exactly the age of the Xiaomi Redmi phone: from the box to service codes

Buying a used Xiaomi Redmi smartphone is always risky: a seller can hide the real age of the device, overstate its fortune or even sell a fake. Even new devices from stores sometimes lie in warehouses for years, and this critically affects battery life and performance. How can you check how old your Redmi is and have not faced fraud?

In this article, we will discuss 6 working ways to determine the production date of Xiaomi Redmi - from simple (check box) to technical (decoding the serial number through the engineering menu), you will learn what data can be trusted and what is easy to forge, how to distinguish the original from the replica by trivia, and why the age of the phone directly affects its market value. All methods are tested on the Redmi Note 10/11/12, Redmi 9/10/13C models and are relevant for 2026.

1. Checking the production date on the box: what to look for and how not to make a mistake

The quickest way is to look at the serial number sticker on the original box. Look for a line that says Made in... or MFRD DATE.

• 📅 MGG-MM-DD – full date (e.g., full date, 2022-05-15). It is found on new models of Redmi Note 12 older.
• 📅 MM/HG or HGMM – abbreviated version (for example, 03/23 = March 2023). Typical of Redmi. 10A or Redmi 9C.
• 📅 4 digit code (e.g. 2208) – the first two digits of the year, the last two digits of the week (here: 2022, 8th week) = February).

⚠️ Attention: Fraudsters often fake boxes by sticking new stickers:

⚠️ Note: If the sticker looks fresh (without rubbing) and the box is dusty or dented, it is a sign of a swap. → The phone. → General information. They should be the same!

On the original Xiaomi boxes, the font on the sticker is clear, without blurring, and the paper is slightly rough. Counterfeiting often has a glossy surface, curved glue and typos in words (for example, "MADR IN CHINA" instead of "MADE IN CHINA").

2. Decoding of the serial number (S/N): Algorithm for all Redmi models

The serial number (S/N) is a unique device identifier that contains encrypted manufacturing date information.

• 📱 In settings: Settings → The phone. → General information → Serial number.
• 📄 On the sticker under the battery (if the phone is collapsible).
• 🖱️ Through computer: connect your phone in Fastboot mode and type in the command fastboot getvar all (look for serialno line).

Xiaomi serial number format: 8 digits + 7 letters/digit (example: 12345678ABCDEFG). The first 4 digits are the year and week of production:

• 🔢 The first two digits are a year (for example, 21 = 2021).
• 🔢 The next two digits are week (01 to 52).

An example of decryption:

Important: On models older than 2018 (e.g. Redmi 6/7), the format may differ – the first 6 digits indicate the date in the format of the GMDDD. If your serial number does not fit the described patterns, use the IMEI verification method (section 4).

3. IMEI Check: Online Services and Hidden Nuances

IMEI (International Mobile Equipment Identity is a 15-digit code that is assigned to each phone, and it's not only unique, it's also tied to a production date. IMEI possible:

• 📞 Dialing *#06# — a window will appear 1-2 numbers (if two slots are available for SIM).
• 📱 In settings: Settings → The phone. → General information → IMEI.
• 📄 On a sticker under the battery or on a box.

To check the age by IMEI:

1. Go to IMEI.info or SNDeeP.
2. Enter the IMEI in the verification field.
3. Look for Date of Manufacture or Production Date.

⚠️ Note: Online services may show an inaccurate date if:

⚠️ Attention: IMEI The phone has been modified (for example, after a motherboard repair) or assembled from spare parts, in which case the service will show the date of production of the oldest part, and some Redmi models (for example, for the Chinese market) may not appear in the databases.

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If the service doesn’t find your IMEI, try entering the first 8 digits (TAC code) on the TAC-List site to help determine at least the year of release.

4. Engineering menu and service codes: hidden data

For power users, there is a way to find out the production date through an engineering menu, which works on most Xiaomi Redmis, but requires caution – wrong actions can lead to failures.

Instructions:

1. Open the Phone app.
2. Enter the code ##4636##
3. Go to the tab Information about the phone.
4. Look for Date of Manufacture or Hardware info.

If the code doesn’t work, try alternatives:

• 📱 ##284## - Test equipment (see Production Date).
• 📱 ##36446337## - information about the version of the software and the date of assembly.

⚠️ Note: Not all Redmi models support these codes. on some firmware (e.g. global versions) MIUI 14+) The engineering menu can be blocked, in which case use the serial number method or IMEI.

5. Physical examination: how the age of the phone affects its condition

Even without serial numbers and codes, you can roughly determine the age of Xiaomi Redmi by external signs.

• 🔋 Battery: If the phone is running out 3-4 with moderate use, it is likely to 2+ Bloated battery (body "open") is a sign of age 3+ years.
• 📸 Camera: Scratches on the lens glass – the phone was often worn without a cover (age 1 year), blurred photos in good lighting – wear of the matrix is possible (typical for models older than 2020).
• 🖥️ Screen: Yellow spots on the edges (burnout) - a sign OLED-screen age 2+ Scratches, invisible when the screen is off, but visible in the light - the phone was used without glass (age from 6 months).

Check the ports and buttons:

• 🔌 A loose connector USB-C 3.5 mm (for headphones) – a sign of active use of 1.5+ years.
• 🔘 Loudness/Nutrition buttons fail or creak – the phone has often dropped (age 1 year or older).

These signs don't give you an exact date, but they do help you gauge how honest a seller is, for example, if they say they bought a phone six months ago but the battery is already holding a charge of 2 hours, that's a complete hoax.

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The combination of physical wear and data from the serial number/IMEI gives the most accurate picture, so if both methods show different ages, you're either a fake or a phone after a major repair.

6. Check through official Xiaomi services: MIUI and Mi Account

If the phone is linked to a Mi Account, you can try to find out the activation date through official channels, which only works for devices that have at least once registered with Xiaomi.

Instructions:

1. Sign in to the Mi Account website under the same login as on your phone.
2. Go to the Devices section.
3. Find your Redmi on the list and click on it.
4. Look for the first activation date.

⚠️ Note: This method shows the date of first switching on, not production, the difference can be from several days (new phone) to several years (laid in stock:

• 📵 The phone has never been linked to an account.
• 🔄 The device was reset to factory settings.
• 🌍 Buying in China (there are often no global accounts).

Alternatively, you can ask Xiaomi’s official service center for a history of the device, which requires a check or a box, which is not always available in Russia and the CIS, but is standard practice in Europe and China.

FAQ: Frequent questions about the age of Xiaomi Redmi