The problem of sending messages can take the smartphone owner by surprise, especially when you urgently need to contact loved ones or confirm an important transaction in the bank. Often the cause of the failure is not the absence of a network signal, but the incorrectly specified address of the message center (SMSC). In Xiaomi smartphones running the shells MIUI or the new HyperOS, this parameter is hidden by default from the user’s eyes in the standard interface, which causes certain difficulties in diagnosis.
The SMSC number is the technical gateway through which your message enters the operator's network for further routing to the recipient. If the phone's memory is incorrect code or the field is empty, the messages will hang in the "Submit" status indefinitely. In this article, we will discuss in detail all the available ways to check the current settings and make the necessary adjustments without going to the service center.
It is worth noting that in most cases, modern Redmi and Poco devices get the correct settings automatically when installed. SIM-However, software failures, flashing or manual intervention in system files can bring down these parameters. Understanding where to look for this information will help you quickly restore the standard Messages application to work».
What is SMSC and why is it needed?
Service Message Center (SMSC) is a special number on the mobile operator's network that receives your text messages and forwards them to the recipient. It's a kind of mail sorting center for the digital world. When you send an SMS, it doesn't fly directly to the person's phone, but first goes to that server. If the subscriber is off or out of reach, it's the SMSC that stores the message and tries to deliver it later.
A unique digital code can be reserved for each mobile operator and even for each region. In Xiaomi devices, this number is usually written automatically when you first activate it. SIM-maps through protocols OTA (However, when changing region, using corporate tariffs or installing custom firmware, the automatic setup may not work.
The wrong message center address keeps outgoing messages from within your device, you can see the rotating signal, but you end up with an error notification, and it's important to understand that incoming messages can come in normally, because the carrier knows where to look for you, but your phone doesn't know where to send outgoing traffic.
⚠️ Warning: Never change the number SMSC This will result in a complete blockage of the outgoing SMS-Communication until the correct value is restored.
Using the Engineering Menu to Check Settings
The fastest and most reliable way to find out the current SMS number on Xiaomi is using a hidden engineering menu, which is designed for developers and service engineers, so it provides access to deep modem settings that are hidden in the regular menu.
Open the Phone app and dial ##4636##. If your region or firmware version allows access, the Test menu will open. Here, select Phone Information. Scroll down to SMS Center. The SMSC field will display the current number in an international format.
If the code doesn't work and the menu doesn't open, your version of the MIUI shell may be blocking access to this menu for regular users, so try the alternative code ##6484##, which opens the CIT menu, although access to modem settings is less common there, and access may be blocked by the carrier.
What if the code doesn't work?
In the testing menu, you can also see the Refresh button or the field for entering a new number. Be extremely careful when entering data manually. The number should be entered in an international format where the plus is replaced by the country code. For example, for Russia this will look like +79160000000 (conditional), but in the SMSC format, a specific length encoding is often used, so it is better to copy the existing number for reconciliation.
Verification through the standard messaging annex
In some versions of HyperOS firmware and older MIUI builds, it is possible to change the message center number directly through the application interface, a method less reliable because in modern versions of Android, Google and Xiaomi hide this option to avoid accidental errors by users.
Go to the standard Messages app. Click on the three dots in the top right corner or the profile icon to open the menu. Select Settings. Then look for the "Additional" or "SMS" section. If the operator and Android version allow, there will be a "Message Center" item. Inside you will see a number that can be edited.
- 📱 Open the Messages app on the home screen.
- ⚙️ Go to the settings menu via the “More” button or three dots.
- 🔍 Find the "Additional" or "Extended Settings" section SMS».
- ✏️ Check the field "Message Center Number».
If you don’t find such a item, it means that your version of the Android operating system or shell is a slate. MIUI This is normal behavior for Android 10 and higher, where control is used. SMS-The gateways are strictly regulated by the security system. USSD-commands or third-party applications.
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If the settings item is not in the menu, do not try to find it through a search in the phone settings – MIUI system search does not index hidden modem options.
Use of the USSD-operator
The universal way that works on any phone, including Xiaomi, Redmi and Poco, is to request information directly from the carrier. USSD-codes that let you know or reset message center settings, which is especially useful if the phone's menu is locked or not working properly.
For large Russian operators, there are standard commands that display information about the current profile or allow you to reset the settings to factory. After you enter the command, a pop-up window with a text response from the network will appear on the screen. Please note that these codes can be changed by operators, so it is better to check the relevance on the official website.
| Operator. | Verification/reset team | Commentary |
|---|---|---|
| MTS | *111*123# | SMS settings menu |
| Beeline | *110*071# | Parental Control (often containing settings) |
| Megaphone | *505# | Service menu |
| Tele2 | *155*00# | Service settings |
| Yota | *103# | Service menu |
It's often easier not to check the number, but to request it to be resubmitted, and for that, most operators have a command to reset settings to standard ones, for example, MTS might have a command to reset Internet settings and mms, which will affect and affect the Internet. SMS-After the restart, the phone will request configuration from the network again.
Third-party applications for SMS management
Since standard Android tools often restrict access to technical options, there are many applications created specifically for managing the Google Play Market. SMS-These utilities use system systems. API read-and-write parameters SMSC, It's bypassing the limitations of the interface. One of the most popular and proven solutions is the app «SMS Center Number».
Once installed, it will immediately display the current message center number read from your Xiaomi modem. If the number is wrong or the field is empty, you can enter the correct value (you need to know it in advance on the operator’s website) and click the Update or Set button. The application will request permission to send SMS (this is necessary for the system recording of the parameter), then apply the settings.
- 📥 Download the app «SMS Center Number or equivalent from Play Market.
- 🔐 Provide the application with the necessary permissions to work with messages.
- 👀 Copy the displayed number or check it against the official operator number.
- 💾 If necessary, enter the correct number and press the update button.
It is important to understand that such applications only work with the standard SMS protocol. If you use Rich Communication Services (RCS) or Google Chat apps, they can ignore the classic SMSC when working over an Internet channel. However, for ordinary text messages and confirmation codes from banks, using a third-party manager is often the only solution.
⚠️ Note: When using third-party applications to change SMSC make sure you download them from the official Google Play Store. SMS This could threaten the security of your data.
Common Errors and How to Resolve Them
Even after checking the message center number, delivery problems can persist. In Xiaomi’s ecosystem, there is an aggressive energy saving system that can block the system services responsible for transmitting data in the background. If the SMSC number is correct, but the messages do not go away, the problem lies deeper.
A common mistake is the conflict between SIM-If the phone has two SIMs, and the default is for calls and SMS You pick one, but you're physically better at catching the other, you might have timeouts, and you might want to check if you've activated Spam Blocking in your security app. MIUI, which may mistakenly classify service messages as spam.
☑️ Diagnosing problems with SMS
Another important aspect is the number format. In some cases, especially when using corporate SIM cards or virtual carriers, the message center number should be written in a specific format with a length prefix. For example, instead of the usual +7... you may need a 917... no plus. The exact format is best specified in the technical support of your operator.
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In 90% of cases, the problem is solved by simply restarting the smartphone after checking the SMSC settings, as this updates the registration in the network.