How to unlock calls on Xiaomi phone: from blacklist to bugs SIM-map

Have you suddenly found that your Xiaomi smartphone has stopped receiving or making calls?This problem can manifest itself in many ways, from the complete absence of a network signal to blocking specific numbers through a blacklist. The causes range from banal settings to hardware malfunctions – for example, slot damage. SIM-card-break IMEI. In this article, we will analyze all possible scenarios and offer working solutions, including hidden settings. MIUI, which are rarely mentioned in official documents.

Xiaomi, Redmi and POCO phones have a backup feature for blocking calls, so in addition to the standard blacklist in the Phone app, blocking can be activated through Settings → Apps → Permissions → Phone or even at the level of Google services (for example, through Spam Protection). We analyzed the 12 most common causes of blocking and selected 5 universal methods of restoring communication, from the simplest to the most technically complex.

1. Checking the basic settings: SIM-map and flight mode

Before you dive into deep settings, rule out the obvious reasons. Start by checking your physical condition. SIM-card: remove it from the slot and inspect it for contact damage or contamination. Even microscopic dust can disrupt the connection. If the card is OK, reboot the phone, it will reset the temporary errors of the communication module.

Next, make sure that:

• 📶 Flight mode is disabled (check notification panel or Settings) → SIM-maps and mobile networks).
• 📱 B Settings → SIM-maps and mobile networks → Name of the access point (APN) the correct parameters of your operator are selected (for example, for MTS it is Internet.mts.ru).
• 🔄 In the same menu, the option “Enable mobile data” and “Enable calls” for your SIM-map.

If the connection has not recovered after these manipulations, move to the next step. 12T or POCO F5) post-refresh MIUI 14 may reset priority SIM-Call cards. In this case, go to Settings. → SIM-maps and mobile networks → Priority SIM-maps and manually select a card for voice communication.

2. Blacklist and Spam Protection: Where to Look for a Block

Xiaomi has integrated multiple layers of protection against unwanted calls, and the lock can be activated in one of three locations:

1. Local blacklist in the Phone app: Open the app, click ⋮ (three-point) → Check if your number or the number you're trying to contact is there, delete it by clicking on the basket next to each contact.
2. Spam protection in MIUI: Go to Settings → Apps → Phone → Permissions → Spam Protection. Disable the “Block Suspicious Calls” option and check the list of blocked numbers.
3. Google Spam Filter: Open the Phone App ⋮ → Settings → Spam and protection → Google Spam Filter: Turn it off temporarily to check if the system is blocking calls wrongly.

Important: If you are using duality SIM-maps, blacklists can be linked to a specific card. SIM separately.

3. Network reset: when standard methods don't work

If calls are blocked at the network level (e.g., no service or emergency calls only) reset network settings, which removes all stored Wi-Fi networks, passwords, and mobile settings, but often resolves connection issues.

Instructions:

1. Open the Settings. → SIM-maps and mobile networks.
2. Click Reset Mobile Network Settings (on some models, the path may differ: Settings → System → Reset → Reset Network Settings).
3. Confirm the action and restart the phone.

Once the phone is restarted, it will automatically connect to the operator's network. If the problem persists, check if your operator has activated the Outbound Prohibit service (for example, Beeline or Tele2 can block calls with a negative balance).

4.IMEI problems: When the phone "can't see" the network

One of the most serious reasons for blocking calls is loss or damage. IMEI — This can happen after you have a malfunctioning firmware update, factory reset, or custom firmware, or if the phone is not catching the network at all, or if the message "Valid" is displayed. SIM-map».

To check for IMEI, dial *#06# in the phone app. If you see Null or Invalid instead of a 15-digit number, you will need to restore.

1. Download the archive with the original firmware for your model from en.miui.com.
2. Use the Mi Flash Tool to flash your phone in EDL mode (you’ll need an unlocked bootloader to do this).
3. Once you have the firmware, check the IMEI again. If it hasn't recovered, contact the service center - self-editing the IMEI via the engineering menu (#4636##) may be illegal in some countries.

Warning: Recovery IMEI on models with a Qualcomm Snapdragon processor (for example, Xiaomi) 11T pro POCO X4 Pro) requires special equipment — QCN-file UFI. Don’t try to do this without experience!

5. Blocking by the operator: how to check and remove restrictions

Operators may block outgoing or incoming calls for several reasons: negative balance, suspicious activity (such as bulk SMS) or activation of the Antispam service.

If the operator has confirmed the blocking, ask to remove it, specifying the reason. for example, it may take up to 24 hours to unlock after replenishing the balance. If you suspect fraudulent activity (for example, if the number was used for spam), the operator may require you to visit the office with a passport.

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If you travel frequently, check if your carrier’s roaming control service is activated and can automatically block outgoing calls abroad to save money.

6. Hardware malfunctions: when you need to carry your phone to the service

If all the software methods have been tried, but the phone still doesn't ring, the problem may be in the hardware.

• 📡 Damage to the antenna module (e.g. after falling or getting moisture) Symptom: the phone catches the network only in certain positions or near the window.
• 🔌 Malfunction SIM-oxidation of contacts or mechanical damage. Check if the second one works SIM-card (if any).
• 🔋 Unstable power supply of the communication module due to a bloated battery or damaged plume.
• 📱 Modem malfunction (relevant for phones after repair or replacement of motherboard).

For a diagnosis, contact the Xiaomi service center. The cost of repair varies:

• Replacement of the antenna module: from 1,500 to 3,000 rubles.
• Repair of SIM-slot: from 800 to 2000 rubles.
• Diagnostics of the communication module: free of charge (if repair is performed in the same center).

Critical information: On Xiaomi models with a MediaTek processor (such as the Redmi Note 11 or POCO M4 Pro), hardware failures of the communication module are often disguised as software errors. If the phone stopped ringing after the update, it is not always the fault of the firmware!

FAQ: Frequent questions about blocking calls on Xiaomi