How to check the release date of the Xiaomi phone: official and hidden methods

Are you planning to buy a used Xiaomi smartphone, but the seller assures that the device is “very new” even though the price is suspiciously low? Or want to know how old your Redmi Note 10 is to see if it’s time to change the battery? The release date of the phone is a critical parameter that affects cost, warranty and even performance. Unfortunately, Xiaomi does not specify the year of production on the case or in the settings, but there are at least 7 ways to find out this information – from official services to engineering codes.

In this article, we will look at all the current methods for checking the release date for Xiaomi, Redmi and POCO smartphones, including the models of 2026. You will learn how to decipher the serial number, where to look for hidden tags on the box, and why the production date on AliExpress is often forged in product cards.

1. Serial number check (S/N) — most accurate

The serial number (Serial Number, S/N) is your phone’s unique identifier that contains encrypted release date information. Xiaomi’s serial number format depends on the year of production, but in most cases, the date can be extracted from the first 4-6 characters.

Where to find the serial number:

• 📱 In the phone settings: go to Settings → The phone. → General information → Serial number.
• 📦 On the box: usually on a barcode sticker (near the IMEI).
• 🔋 Under the battery: if you have a removable battery model (e.g. Redmi) 4A).

How to decipher the date:

• 🔢 Format 2018–2020 first 4 Numbers: year and week, for example, 1935 = 35-I'm a week. 2019 year-end).
• 📅 Format 2021–2026 first 6 Symbols: year/month/day (e.g, 230815 = 15 August 2023 year-end).
• ❓ Exceptions: for some models (e.g, POCO F3) date is encoded in 3-4 characters after the letter prefix.

⚠️ Note: If the serial number begins with the letters ZD, ZC or ZB, It could be a repair phone (replaced charge), and the date indicates the date of repair, not release.

2.IMEI Test: Does This Method Work for Xiaomi?

IMEI is another unique phone identifier, but unlike the serial number, it doesn't contain direct release date information, but with IMEI, you can tell the month and year of the phone's activation online, which indirectly indicates its age.

How to check:

1. Find out your phone's IMEI: Enter the code *#06# in the phone app. Look at the sticker under the battery or on the box.

IMEI.info

IMEI24.com

First Activation Date

Warranty Date

Limitations of the method:

• ⏳ The activation date may be several months later than the production date (if the phone was in stock).
• 🔄 If the phone has been reset or stitched, the activation date may be reset.
• 🚫 It doesn’t work for phones bought in China (IMEI Not tied to global bases).

3. Production date on the box: where to look and how not to make a mistake

Xiaomi’s phone box contains several labels that can be used to determine the release date, and the key is to know where to look and how to distinguish the original sticker from the fake.

Where to watch:

• 📦 Barcode sticker: usually at the end of the box. MFG Date or Date of Manufacture.
• 🏭 Batch Code: often encrypted in format YYWW (year/week, for example, 2245 = 45-I'm a week. 2022 year-end.
• 🔍 Hidden code under film: on some boxes (e.g. Xiaomi) 12T) date stamped under protective film.

Examples of boxes on different years:

⚠️ Warning: On AliExpress and other marketplaces, vendors often forge stickers on boxes, indicating a more recent date!

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If the date is in a dull print or blurred on the box, it's a sign of a fake. Xiaomi's original tags are always clear and contrasting.

4. Engineering menu and hidden codes: for advanced users

If the serial number and box are not available, you can try to find out the release date through the engineering menu or special service codes. This method is suitable for Xiaomi models on Qualcomm processors (for example, Redmi Note 11, POCO X4 Pro).

Instructions:

1. Open the Phone app and enter the code: ##4636## (if it doesn't work, try ##284###).
2. In the menu that opens, select Phone Information or Hardware Info.
3. Look for the Manufacture Date, RF Cal Date, or Board Date fields.

What do the fields mean?

• 📅 Manufacture Date – Payment Date.
• 📡 RF Cal Date - Calibration date of radio frequencies (usually the same as the release date).
• ⚠️ Board Date – motherboard manufacturing date (may be earlier than phone assembly date).

Make sure your phone is 50% or more charged.

Close all background applications

Use the original keyboard (not third-party)

Do not change the settings in the engineering menu without experience

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Limitations:

• 🔒 On some firmware (MIUI 14+) Engineering menu blocked.
• 🔄 After firmware, the date may be reset or show an incorrect value.
• 📱 Does not work on phones with MediaTek processors (e.g. Redmi) 10A).

5. Official Xiaomi services: check on the warranty

Xiaomi provides official warranty status verification tools that indirectly help determine the release date.The warranty on most models starts at the time of production, not sale.

Methods of verification:

1. Xiaomi support site: Go to mi.com/global/verify. type in IMEI or serial number. In the results, look for the Warranty Period field - the beginning of the warranty usually coincides with the date of production.
2. Mi Support: Download the app from Google Play. Select Device → Warranty Check. The system will show the start date of the warranty.

Examples of decryption:

• 📅 If the guarantee is valid with 2022-11-01, The phone is released no later than October 2022.
• ⏱️ For models with an 18-month warranty (e.g. Xiaomi 13), the production date may be 1-2 months ahead of the warranty period.

⚠️ Attention: If during the inspection IMEI On the official website, you see a message saying "This device is not covered by warranty", which may mean that the phone is not covered by warranty: 🔧 Was in refurbishment with a replacement fee (IMEI changed). 🌍 Sold as a grey import (e.g. version for China). ⏳ Warranty period has expired (more than 12-24 months from the date of production).

Physical examination of the phone: indirect signs of age

If you don't have a box and access to settings, you can roughly determine the release date by the outside, which is not accurate, but it can help you identify a clear mismatch with your stated age.

What to look out for:

• 🔋 Battery: If the phone runs out in 3-4 hours with moderate use, it is more than 2-3 years old. Bloated battery (see on the raised screen) - a sign of age 3+ year-end.
• 📱 Body and screen: Yellowed screen backlight (especially on a white background) – phone older than 2020, erased inscriptions on buttons or logo – a sign of active use.
• 🔌 Charging port: Rust or backlash in the connector USB-C — The phone has been in use for more than 1 year, scratches around the port are a sign of frequent connection (age 2).+ year-end).

Comparison of battery status by age:

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If a seller claims that the phone is “six months since it was bought” but the battery lasts less than 12 hours, that’s a clear sign of cheating, and even with heavy use, the capacity doesn’t drop as quickly in 6 months.

7.Check on Xiaomi model and release history

If you know the exact model of the phone, you can find out the date of its official announcement and estimate the age. Xiaomi usually starts mass sales 1-2 months after the presentation.

How to check:

1. Find a phone model in Settings → About Phone → Model (e.g. 22101320G for Redmi Note 12 Pro+).
2. Check the date of the announcement on official sources: Official site Xiaomi (Press section). GSMArena (in the model card look for Announced).

Examples of the dates of announcements of popular models:

• 📱 Xiaomi 13 – December 2022 (mass sales since January 2023).
• 📱 Redmi Note 11 – October 2021 (Sales from November 2021).
• 📱 POCO X4 Pro – February 2022 (on sale from March 2022).
• 📱 Redmi A2 — March 2023 (on sale from April 2023).

Important:

• ⏱️ Announcement date ≠ The date of production of your particular phone (may vary from 3 to 6 months).
• 🔄 Some models, for example, POCO M4 Pro) were issued in several audits with a difference of six months.

FAQ: Frequent questions about Xiaomi release date