Locking lost Xiaomi phone by serial number: step-by-step instructions through the official website

Loss or theft of a smartphone is a stressful situation, especially if the device stores personal data, photos or access to banking applications. Owners of Xiaomi phones (including the Redmi, POCO and Mi series) have the unique ability to remotely lock the device not only through an associated Mi Account account, but also by serial number - even if the phone was not previously synchronized with the cloud.

But it's important to understand that serial number locking is nuanced, for example, it won't work if an attacker has already dropped the phone to factory settings or replaced the motherboard. In this article, we'll look at all the official and alternative ways of blocking, including those available without an account binding, and explain why some methods (like IMEI locking) work in Russia, and if your Xiaomi disappeared less than an hour ago, act quickly, following our instructions.

1.Where to find Xiaomi's serial phone number if it's lost?

Serial number (S/N) is a unique device identifier that is required to lock through the official website.If you haven't saved it in advance, there are several ways to recover:

• 📄 Phone box: the serial number is indicated on the sticker along with IMEI. It usually starts with letters. SN: or S/N:.
• 📱 Backup in Google Drive: If the phone has been synced to a Google account, the serial number can be stored in the backup.ab file (requires parsing through special utilities).
• 💳 Check or warranty card: in the documents of the store often duplicate the serial number and IMEI.
• 🖥️ Accessories packaging: Some Xiaomi chargers or cases have phone data stickers.

If none of these methods worked, try to remember if you registered your device on the official Mi Account website. The user profile in the Devices section can display the history of connected gadgets with serial numbers. Also check your email - when you first activate your phone, Xiaomi sends a letter with technical data.

⚠️ Note: If the serial number is lost irrevocably, blocking through the site will not be possible. IMEI (You can find it through a carrier or use Google’s Find My Device service (if the phone was linked to an account).

2.Official method: blocking through the Xiaomi website by serial number

Xiaomi provides a tool to remotely lock devices via a web portal, which only works if the phone was tied to a Mi Account before the loss. If there was no link, go to the alternatives section.

Step-by-step:

1. Go to the Mi Account login page and log in.
2. In the menu, select Find Device (or Find Device in the Russian version).
3. In the list of devices, find the lost phone. If it's not there, click Add Device manually and enter the serial number.
4. Select the option Block Device (Block Device).
5. Confirm the action via SMS or email (depending on your account settings).

Once locked, the phone will be unavailable for use: the screen will show a lock message with your contact details (if you have specified them). Importantly, this method does not erase data from the device, but only restricts access to the system. Erase Device (not available on all models) will be required to completely delete the information.

Make sure your phone is linked to your account|Check access to email/SMS confirm|Keep the serial number and IMEI file-by-file|Prepare the data for the police (if you plan to file a statement)-->

Limitations of method

Blocking through the serial number on the Xiaomi website has a number of nuances:

• ❌ It does not work if the phone has been reset to the factory settings (hard reset).
• ❌ Not blocking. SIM-Card (the attacker can use mobile communication).
• ❌ Not effective if the device has been re-interrupted with replacement MIUI custom-made.
• ✅ It works even without the Internet on the phone (blocking is activated when you first connect to the network).

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If your phone is stolen, lock it immediately. SIM-The card is at the operator's, which will prevent access. SMS (For example, to confirm payments) and help track the device from cell tower data.

3. Alternative ways to block without Mi Account

If the phone was not tied to a Xiaomi account, it is not possible to officially lock the serial number, but there are workarounds:

Method 1: Blocking with Google Find My Device

If you have access to Google services and sync with your account on your phone, use Find My Device:

1. Sign in to the service under the same Google account as on your phone.
2. Select the lost device on the map.
3. Click Lock the device and set the password.
4. Optionally: Add a message with contact details for the finder.

This method works even if the phone is disconnected from the Internet – the lock is activated the next time you connect.

Method 2: Calling the police with IMEI

In Russia, the IMEI blocking through telecom operators (blacklist) has not officially been in operation since 2018.

• 📝 You can file a report with the police, stating IMEI (You can find it through checks, a box or a communications operator).
• 🔍 If the phone is found, it will be returned to the owner. IMEI.
• ⚖️ Theft. IMEI assist in the trial.

Method 3: Remote data erasure (if the phone is online)

You can use Mi Account or Find My Device to run an Erase Data command, which will delete all information, including photos and apps, but not lock the device itself, and use this method if your phone has critical data.

⚠️ Warning: Once the data is erased, it will be impossible to recover it even if the phone is found!

4.How to check if Xiaomi phone is locked?

If you have blocked it through Mi Account or Find My Device, you can check its status:

If the lock doesn’t work, repeat the procedure or contact Xiaomi via the official website, specify the serial number and describe the problem – sometimes the lock has to be activated manually.

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Mi Account locking is the most reliable way, but it only works if you have your phone tied to your account beforehand. If you haven't, use Google Find My Device or contact the police.

5.What to do after blocking: further actions

Even after successfully locking your phone, there are still risks. Follow this checklist to minimize damage:

• 🔒 Change passwords from all important services (email, social networks, banks) that were available on the phone.
• 📱 Revoke access to applications in Google Account (Security) → Your devices).
• 💳 Block your bank cards if they were linked to Google Pay or Mi Pay.
• 📋 Report to the police (especially if the phone is stolen). IMEI and serial number.
• 🔄 Check backups – some of the data can be recovered from the cloud.

If you find a phone, you can unlock it through the same Mi Account or Find My Device, which requires you to enter the password from the account that was used to lock it, and if you deleted it remotely, you have to reconfigure the device.

If you're a thief, don't try to track your phone yourself, it can be dangerous. Give the data to the police and trust the professionals.

6. Frequent mistakes and how to avoid them

When locking a Xiaomi phone, users often make critical mistakes that nullify their efforts, and the most common ones are:

• ❌ Forget to block. SIM-Aftists can use it to confirm payments or register with services.
• ❌ They don't keep the serial number./IMEI Without this data, no lockdown through official channels is possible.
• ❌ Use unofficial services to block the IMEI. Many of them are fraudulent.
• ❌ You don't check backups. You can often recover data from Google Drive or Mi Cloud, but users forget about it.

Another common mistake is trying to unlock your phone via Fastboot or EDL-post-lock mode. On modern Xiaomi devices (c) MIUI 12 and later) this is virtually impossible without an official unlocker that requires confirmation from the previous owner.

⚠️ Note: If you bought a used Xiaomi phone and it was blocked through Mi Account, you can return it to working condition only with the help of the previous owner".

7. FAQ: Answers to frequent questions