Xiaomi Redmi smartphones are famous for their functionality, but sometimes users face unexpected limitations in the operation of cellular communication.The situation when the Redmi 7 device refuses to make outgoing calls or receive incoming calls can be caused by software failures, blacklist settings or restrictions on the part of the operator.
In this article, we will take a closer look at all possible causes of blocking calls and provide comprehensive instructions for eliminating them, learn how to check call ban settings, reset network settings, and use engineering codes to restore full functionality to your gadget.
Diagnostics of the reasons for blocking calls
Before you start active unlocking, you need to pinpoint the source of the problem. Often users confuse a software failure with a physical malfunction or lock on the part of the service provider. On a Redmi 7 device running a MIUI shell, diagnosis begins with an analysis of the status bar and the behavior of the SIM card.
Look at the network indicators at the top of the screen, if you see a crossed-out SIM card icon or a "No Network" sign, the problem may be physical contact or no signal. If there is a network but calls are not going through, it's likely that the call ban is activated at the phone or operator setting level.
⚠️ Attention! If the device requests after restarting PUK-code, do not enter arbitrary combinations, three wrong attempts will lead to final lockdown SIM-The card can be restored only in the operator’s office.
It is also worth checking whether the Do Not Disturb function or flight mode is activated, which can simulate blocking incoming connections, and for accurate diagnosis, it is recommended to temporarily remove the SIM card and insert it into another phone to eliminate problems with the SIM itself.
Configure call ban in the MIUI system
In the Android operating system with the MIUI shell, there is a built-in call management mechanism that allows you to flexibly adjust incoming and outgoing traffic. Often users accidentally activate the lock function of all incoming or outgoing, without knowing how to turn it off. To get to the desired menu, go to the Phone application and click on the three dots in the upper right corner.
In the menu that opens, select Settings, and then find Prohibit Calls, and that's where the key switches that control your number availability are hidden, and the system will offer you a few constraints that you can combine.
- 📞 All Outgoing: Complete ban on making calls from your device.
- 📥 All incoming: Callers hear a “busy” or “unavailable” signal when trying to reach.
- 🌍 International: blocking calls abroad (can be activated by default in some regions).
- 📱 Roaming: ban on network use in other countries.
To unlock, you need to uncheck the active box. The system can request a call-free password. If you haven't changed it, try the standard 0000 or 1234 combinations. If the standard codes don't fit and you don't remember the password, you'll need to reset your call settings through an engineering menu or reset your phone completely.
Use of the USSD-lock-in
Cellular operators provide users with the ability to manage call ban services directly through USSD-This method is especially effective when the phone settings fail because the lock is removed on the network side. For Redmi 7, this method is one of the fastest.
Open the dialing app and enter the command *#33#. This is a universal query to check the status of all kinds of locks, and the screen will display a list of active restrictions, and to unlock all services, usually a command is used #33*0000#, where 0000 — This is your password set by the operator (often the same as your password). PIN-sim-card).
There is also a more detailed approach to managing services through codes:
- 🔓 ##002# – Complete cancellation of all redirects and prohibitions (universal reset).
- 🔓 #33*Password # - unlocking outgoing calls.
- 🔓 #35*Password # – unlocking incoming calls.
- 🔓 #333*Password # - Unblocking international calls.
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If the standard 0000 password doesn't work, try 1234 or 1111, and you can find out the exact password in your mobile operator's personal account or by calling support.
After you enter the command, wait for a pop-up notification of the successful execution of the operation. If an error message arrives, then the service has already been disabled or the wrong password has been entered.
Reset network settings and APN access points
Sometimes the problem is not overt locks, but incorrect network settings that may have been lost after updating the MIUI firmware or replacing the SIM card. Network resets return connection settings to factory values, which often solves the problem with registration on the network.
To perform this operation on Redmi 7, go to the Settings menu, then select Advanced Settings (or Additional) and find Recover and Reset. At the bottom of the screen will be the Reset button for Wi-Fi, mobile Internet and Bluetooth. Click on it and confirm the action.
| Parameter | Before dumping. | After discharge |
|---|---|---|
| Saved Wi-Fi networks | Save. | Removed. |
| Bluetooth password | Changed. | Dropped. |
| APN settings | Customized | Factory |
| Mobile Internet | Possible mistakes | It's working right. |
It is important to understand that this process will not affect your personal data, photos or contacts, but you will have to re-enter passwords from home Wi-Fi networks, and once you reboot, the phone will automatically adjust the correct settings of APN access points from your carrier.
☑️ Checklist of net reset
Working with a blacklist and antivirus
The Redmi 7 antivirus and security app have powerful call filtering tools, and blocking can happen selectively if a subscriber’s number is accidentally blacklisted or spam-listed.
Open the Security app (green zipper icon) and go to the Blacklist section. Check the Blocked and History tabs. If you see numbers that you can't reach or call, remove them from the restriction list. Also check the lock settings: it might be "Block All Unknown Numbers" mode.
Also, check the settings of the Phone app itself. In Settings -> Lock, filters may be active that interfere with normal communication. Make sure the Antispam switch does not work in aggressive mode, marking legitimate calls as unwanted.
⚠️ Attention! Some third-party calling apps (e.g. Truecaller, Viber, WhatsApp) can intercept call management. If a problem occurs after installing such software, try removing it or revoking your phone's permissions.
Engineering menu and resetting of radio module
For advanced users, when standard methods fail, the engineering menu is available. This is a hidden part of the Android system that allows you to test and reset communication components. On Xiaomi Redmi 7, you log in via code set ##4636## in the dialing app.
Once you enter the code, you open the Testing menu. Select Phone information. You can see detailed information about the status of the network. Find the Turn off radio button, press it, wait 10 seconds, and then press Turn on radio. This will force the modem to restart.
What to do if the engineering menu code doesn’t work?
Also on this menu, you can check if the network type is set to 2G Only or 3G Only, which in modern coverage can create the illusion of blocking. Set the Preferred network type to LTE/TD-SCDMA/GSM (auto connect) mode for the best reception.
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Forced rebooting a radio module through an engineering menu often solves problems with the "hanging" call status, where the phone shows the network but does not connect.