How to change the SMS center on Xiaomi: the complete guide

The problem with texting is one of the most frequent and annoying failures faced by owners of Xiaomi, Redmi and Poco smartphones. SIM-maps, and in an incorrectly prescribed number of the message center (SMSC). This parameter is a critical gateway: without the correct operator server address, your message will not go anywhere, remaining in the status of “sent".

In the Android operating system that MIUI and HyperOS use, access to these settings can be hidden or changed depending on the regional version of the firmware. Users often try to reset the network settings, but forget to check this particular setting. In this article, we will discuss all available methods for changing the SMSC number, including hidden engineering menus and direct editing through system codes.

Before we start taking any radical action, it is important to understand that the message center number is different for each mobile operator. The wrong number at the end of the number can lead to complete inoperability of the SMS function. We will consider not only ways to change, but also diagnostic methods that will help determine whether the problem lies in the settings of message routing.

What is SMSC and why to change its settings

SMSC (Short Message Service Center is a server that processes all of your text messages, and when you send an SMS, it first gets to that server, which then sends it to the recipient. If the recipient is not available, the server stores the message and delivers it as soon as the subscriber is online. On Xiaomi smartphones, this number is usually written automatically when you first install it. SIM-map.

However, there are situations where the automatic setup fails, which can happen after updating the firmware, changing the region in the phone settings or using custom customized devices. ROM-In such cases, the phone tries to send a message through the wrong gateway, and the operator rejects it. SMSC This is required only if incoming messages are received and outgoing messages are not sent, and the account balance is positive.

Often users confuse APN settings (for mobile Internet) and SMS settings. These are different settings that are in different parts of the system. If you don't have the Internet, editing SMSC won't help. But if the problem is only with text messages, checking and setting the message center number correctly is the first step to solving it.

⚠️ Warning: Do not change the message center number to arbitrary values. Use only the official numbers of your operator, as the wrong address will lead to the loss of the ability to send SMS.

Diagnostics: Why SMS is not sent

Before you get into the technical settings, you need to rule out trivial reasons. Often the problem lies in a crowded phone memory or a temporary failure of the communication module. On Xiaomi devices with a MIUI shell, aggressive battery optimization can block the work of the standard Messages application.

Check the status of the delivery. If the message is in the status of "Sending" for more than a few minutes, and then returns with the error "Not delivered", this is a sure sign of a problem with routing. Also, pay attention to the format of the recipient number: some old message centers require an international format, others work only with local.

There are a number of signs that indicate an SMSC configuration error, rather than a coverage problem:

• 📶 The network signal is there, the calls are passing, but the SMS does not leave.
• 💬 Incoming messages come but you can’t reply.
• 🔄 Resetting network settings does not help restore work.
• 📱 On another SIM-The same phone operator's SMS card is working.

If you see at least two of these symptoms, the probability of error in the number of the message center is extremely high, in which case you need to get the current number from the operator and make changes manually.

Method 1: Change through the standard settings menu

The easiest and safest method is to use the built-in Android interface, but newer versions of HyperOS and MIUI 14 often hide this option to avoid random user changes, and yet, on many devices, the path remains standard.

You need to open the Messages app, click three dots in the corner of the screen, and select Settings. Next, look for "Additional" or "Settings" SIM-This is where the message center number field may be hidden".

The algorithm of actions is as follows:

• 🔍 Open the message settings and find the Message Center item (may be hidden in the submenu).
• ✏️ Click on the current number to edit it.
• 💾 Enter the new number received from the operator and save the changes.
• 📲 Restart your phone to apply the settings.

If you don't have a room editing option on your menu, it means that the manufacturer has blocked access through the standard interface, and then you'll have to use the more advanced methods described below. Don't try to find this setting in the phone's general menu, it's tied to the messaging app.

Method 2: Using engineering codes and hidden menus

When the standard path is closed, engineering codes come to the rescue. Xiaomi smartphones with MediaTek and Qualcomm processors have different menus; SMSC changes are most often used with a universal code that opens the test menu.

Type ##4636## on your phone keyboard. This should open the Testing menu. Select Phone information. Scroll down to Settings. SMSC" (SMSC Settings).

Here you will see the field with the current number. Pay attention to the format: the number must be in an international format with a prefix. For example, for Russian operators, the number often begins with +79..., but in hex format it may look different.

1. Enter the correct number in the SMSC field.
2. Click the "Update" or "Set" button.
3. Check the status of the answer - there should be a confirmation of "Success".

In some cases, the ##4636## code may not work on global firmware versions. Then try the ##3646633## (Engineer Mode) code, but beware: changing unknown parameters in this menu may disrupt the radio module.

Current numbers of operators' message centres

To work properly, you need to know your carrier’s exact message center number, which can vary, so it’s always best to double-check them on the official website or at the support service.

It is important to enter a number in the format it is specified in. If the input field requires a plus format, do not use the eight at the beginning. If the system requires a no-plus format, use the international country code.

When entering a number, make sure that you do not make a typo. One extra or missed digit will make the center inaccessible. After entering the number, be sure to click the save or update button.

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Keep your carrier’s message center number in your notes, which will help you quickly restore your SMS in case your phone resets or changes. SIM-maps in the future.

Reset SMS settings via ADB (for advanced users)

If none of the above methods worked, and the phone interface blocks the change of settings, you can use USB debugging. This method requires a computer and an installed package of ADB Tools. It allows you to interact directly with the phone's settings database.

First, turn on "Debugging by" USB" You can go to the developer menu on your Xiaomi. Connect your phone to your PC and open the command line. You'll need to run a command to reset your settings. SMS-applications to factory values, which often causes the system to request settings again SIM-map.

adb shell pm clear com.android.mms

This command will completely clear the message application data. Once it is executed, the phone will restart, and when you first start "Messages", you can automatically adjust the SMSC correctly. You can also try the command to force the network settings to update:

adb shell service call phone 3

Using ADB gives you maximum rights, but you need to be careful. Incorrect use of commands can lead to unstable operation of the system. If you are not sure about your actions, you should limit yourself to standard methods.

⚠️ Note: The pm clear command will delete all your saved drafts of messages and correspondence history in the standard application.

Frequent errors and ways to fix them

Even after you set up correctly, users can run into problems. Often the error is not in the number, but in the application conflict. On Xiaomi, the default is Google's Messages app, but Mi Messaging can also be preinstalled. They can conflict over access rights to the app. SIM-map.

Make sure the application you are using is selected by default to work with SMS. Go to Settings → Applications → Application Management → Three Points → Default Applications → SMS. Select the application you are using.

Also worth checking permissions: In modern versions of Android, apps need to explicitly allow access to contacts and SMS. If the Messages app is denied access to the phone, it will not be able to properly interact with the communication module to send data to SMSC.

Questions and Answers (FAQ)

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SMSCs are a basic requirement for mobile communication to work properly, and without the correct message center number, the phone won't be able to send text messages, even with the perfect signal.