How to block a lost Xiaomi phone by serial number: all working methods

Losing or stealing a smartphone is a stressful situation, especially if the device stores personal photos, access to banking applications or work correspondence. Xiaomi phone owners have a unique opportunity to remotely lock the device not only through standard services like Find My Device, but also using a serial number or a phone number. IMEI. However, many users face confusion: where to get this data, how to link it to an account, and what to do if the phone is already turned off by an attacker.

In this article, we will discuss all the current ways to block Xiaomi smartphones (including Redmi models, POCO, Black Shark) by serial number, from official tools to alternative methods through carriers, with a focus on the nuances of what to do if the Mi Account is not tied, how to check the status of the lock, and why sometimes the serial number is useless without a link. IMEI. You will also learn how to circumvent the restrictions of Chinese firmware versions, where IMEI It may not match the data in the system.

1.Where to find Xiaomi serial number if phone is lost

Serial number (S/N) — This is a unique device identifier that's assigned in the factory. IMEI, It can't be modified software, which makes it a reliable locking tool, but how do you know if you don't have the phone anymore?

Here are 5 ways that will work even after losing your device:

• 📄 Phone box: The serial number is usually listed on the sticker along with the IMEI (look for a line S/N or Serial No.).
• 📱 Backup in Mi Cloud: If you’ve ever synced your data with Mi Account, you can find the number in the Devices section of i.mi.com.
• 📋 Check or warranty card: in the documents of the store often duplicate the serial number (especially if you bought in official Xiaomi salons).
• 💻 ADB-logs (if connected to a PC): if previously used debugging USB, The number can be saved in the logs of the Minimal program ADB and Fastboot.
• 📧 Letter from Xiaomi: when the device was first activated on the email, an email with technical data could come (check the Inbox or Spam folder»).

⚠️ Warning: If you bought a phone with your hands, the serial number on the box may not match the real one! Criminals often fake the package.

If none of these methods worked, the last option is to contact Xiaomi’s service center with proof of purchase (check, warranty), and employees can give information about the device associated with your account.

2.Can Xiaomi be blocked by serial number only?

The short answer is no, the serial number itself does not lock the phone, it is only needed to identify the device in the Xiaomi system, but the direct lock is through:

• 🔒 Mi Account (the main method for all models, including Redmi Note 12, POCO X5, Mi 13).
• 📡 IMEI (via a communications operator or the Interior Ministry base – works even if the phone is turned off).
• 🛡️ Find My Device from Google (if sync with Google account is enabled).

Serial number will be required at the stage of proof of ownership, for example:

• When contacting Xiaomi to unlock after finding the phone.
• To prove that the device is indeed yours (if the attacker reset the settings).
• When submitting a report to the police (together with the IMEI).

It is important to understand that blocking through Mi Account will only work if:

1. The phone is connected to the Internet (Wi-Fi or mobile network).
2. The device has the Find Device function enabled.
3. You did not log out of your Mi Account manually before you lost it.

If the phone is turned off or reset to factory settings, the serial number won't help it lock remotely. IMEI via operator or MVD.

3. Step-by-step instruction: blocking through Mi Account

This is the most reliable way to do this if the phone is still on and connected to the network.

1. Go to the Mi Cloud website and log in to your Mi Account (the same one you had on your phone).
2. From the menu, select Find Device, if not, your model doesn’t support the feature (up to 2018).
3. The map will show the last known location of the phone. In the upper right corner, click Lock.
4. Create a temporary password (at least 6 characters) and enter it twice. This password will be requested when you turn on the phone.
5. Add a message to the lock screen (e.g., "Phone stolen! Please return for a fee" +7XXX»).
6. Press Block and confirm the action.

Make sure your phone is connected to the internet

Check that the “Find Device” function has been activated in the settings

Have a backup on hand email/Recovery of access to Mi Account

Write down the temporary lock password to a secure location-->

After locking the phone:

• 🔐 It is blocked even after restarting.
• 📵 Will not be able to connect to new Wi-Fi networks or SIM-Cards (if the option to Prohibit Use is enabled) SIM).
• 📍 It will display your message on the lock screen.

⚠️ Attention: If an attacker resets the phone via Fastboot, Mi Account lock can fly on Chinese firmware! To avoid this, you had to activate reset protection in the settings before losing it (Settings) → Mi Account → Device protection).

If the phone is already reset, try to restore access through the Mi Account recovery page by specifying the serial number and data from the box.

4. Blocking by IMEI: When the serial number doesn't help

If the phone is turned off or reset, only the lock on the phone remains. IMEI — A unique identifier of the communication module, unlike the serial number, IMEI It can be blocked at the level of telecom operators, which will make the phone useless for the attacker (he will not be able to call, use the mobile Internet).

Here's how it works:

How to block IMEI operator:

1. Call in support of your operator (number: MTS: 0890 Beeline: 0611 Megaphone: 0500 Tele2: 611)

Tell me your phone is stolen and I'll tell you. IMEI. You will be asked to provide passport details and a contract for SIM-map.

After checking IMEI will be blocked for 1-3 days.

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If you have two. IMEI (two-way SIM-You have to lock both cards, otherwise the phone can work with the same network.

The lockdown through the Interior Ministry is more secure, but longer.

If your phone is in China ROM, Here's what you can do:

1. Check the real one. IMEI via *#06# (if the phone is still in hand) or in settings (About the phone) → All parameters. → Status SIM-map).
2. Activate reset protection (if your phone is not lost): Settings → Mi Account → Device protection → Insert reset protection
3. Use Google Find My Device (if you have a Google account attached).
4. Contact Xiaomi China Support via the website mi.com/support (You need a serial number and purchase data).

For owners. POCO And Black Shark has the same rules on Chinese firmware. If you bought a phone in Russia, but the firmware is Chinese, try reflashing it to the global version (the instructions are on the forums). 4PDA or XDA Developers).

6.What to do after blocking: data recovery and security

Even if you find the phone, you might have problems locking it down, and here's a checklist for recovery:

• 🔑 Unlock your phone via Mi Cloud (if you have a temporary password).
• 📱 Check the integrity of the data: sometimes photos or contacts disappear after blocking (if there was no backup copy).
• 🛡️ Change the passwords of all accounts (email, social networks, banks) that were on the phone.
• 📡 Check it out. SIM-card: if it is replaced, contact the operator to restore the number.
• 🔍 Remove the device from trusted in Mi Account and Google account, then re-attach.

If the phone is not found, but you have blocked it. IMEI, Don't rush to buy a new one. Sometimes the devices come back through:

• 📦 Taxi/Café Services (if forgotten in public).
• 🚔 Police (if the theft has been recorded).
• 🤝 Billboards (Attackers sometimes sell locked phones without checking) IMEI).

To avoid problems in the future, set your phone up in advance:

Activate Find Device in Mi Cloud

Link to Google Account and Enable Find My Device

Write it down. IMEI and a serial number to a safe place.

Enable reset protection in Mi Account settings

Set the password on SIM-map-->

7. Frequent mistakes and how to avoid them

Many users make critical blocking errors that make all efforts to nullify. TOP-5 Failures and how not to repeat them:

Another common problem is buying a phone from your hands without checking. IMEI. If you bought Xiaomi “with hands”, be sure:

1. Check it out. IMEI on imei.info (should not be blacklisted).
2. Make sure the phone is not tied to someone else’s Mi Account (ask the seller to log out and reset settings).
3. Check the serial number on the Xiaomi website (authentication check).

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If you bought a used Xiaomi and didn’t check it out IMEI, There's a risk that the phone is already on the blacklist, in which case it won't be used with Russian ones. SIM-maps even after dumping.

FAQ: Answers to Frequent Questions