SMS is not sent to Xiaomi: reasons and solutions

When you stop texting on a Xiaomi smartphone, you can be taken by surprise at the most inopportune moment: you type, you press the send button, but the message remains hanging with a watch icon or an exclamation mark. It's not just a minor problem, but a serious failure in the communication module that blocks communication with the outside world. Often the problem lies not in the hardware failure, but in the software conflict or the operator's settings failure.

Modern devices based on MIUI and HyperOS have a complex power management system that sometimes aggressively “strangles” the background processes necessary for MMS and regular SMS. The user may find that calls pass, the Internet works, and text messages fly to nowhere. In most cases, the situation can be corrected independently without contacting the service center, if you correctly diagnose the source of the problem.

In this article, we’ll look at all the possible causes, from the banal lack of funds on the balance sheet to complex conflicts of system applications. We’ll look at how flight mode, message center settings, and even the date on the device. Follow the instructions consistently to return full functionality to your gadget.

Balance and condition check SIM-map

The first thing you need to do is rule out the most obvious, but often ignored, factors: If you run out of money in your account, the carrier blocks outgoing messages, even if incoming messages may come. USSD-your carrier's code or your bank's mobile app, and you should also make sure that you SIM-The map is correctly defined by the system.

Sometimes the physical contact between the card chip and the smartphone reader is disrupted by oxidation or bias. Owners of two-symbol Redmi or Poco models know that slots can work unstable when changing cards frequently. Try to remove the tray, wipe the contacts with soft dry material and insert the SIM back, making sure that it sits tightly in the socket.

⚠️ Note: If you are using the old SIM-A card that has been hand-cut with scissors to the size of a Nano-SIM can be unstable, often exceeding the standard in thickness, leading to poor contact and data transmission failures.

Remember that some carriers have a separate plan or option for SMS, which can end regardless of the main package of minutes and the Internet. Check the details of expenses in your personal account. It is also worth trying to move the SIM card to another phone to understand whether the problem is in the Xiaomi device or on the carrier side.

• 📱 Make sure that there are funds on the account to pay the tariff or one message.
• 🔄 Restart your smartphone after re-installation SIM-map.
• 📶 Check if the network icon is displayed (2G, 3G, 4G, 5G) status-bar.
• 💳 Wipe out the golden contacts SIM-dried-up cards before installation.

Network settings and flight mode

Often the reason that messages don't go away is because the device is temporarily logged out of the operator's network, and the signal may be complete, but there's no actual connection to the message center. The fastest way to restart the communication module is to activate flight mode, and that completely shuts down all the radio modules on the phone.

Enable flight mode through the notification curtain or in the Settings menu → SIM-Maps and mobile networks. 10-15 So you can take a second to reset all the network settings, and then you turn it off, and the phone will start looking for cell towers again and registering on the network. 80% cases of software "hangs" of the network.

If you have a two-sim smartphone, check which SIM card is chosen to send messages by default. MIUI settings may be lost after the system update. SIM-maps and make sure that for the item «SMS» The card you need is selected, especially if one of them is used only for the Internet.

It is also important to check if you have “only” mode. 5G» or "Only" 4G», If you're in a local area, the coverage of these standards is unstable. 2G/3G Temporarily helps deliver the message, because these networks have more coverage and penetrating capacity in buildings. → SIM-maps and mobile networks → Type of network.

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If messages are not sent only in roaming, make sure that the “Roaming Data Transfer” option is activated in the mobile network settings and the roaming service is connected with your operator.

Cleaning the cache and application data Messages

The app that sends and receives messages accumulates temporary files over time that can get corrupted and cause crashes. In Android, this is solved by clearing the cache. It's important to understand the difference: cleaning the cache will not delete your correspondence, but reset the application's temporary settings.

To do this, go to Settings → Apps → All apps. Find Messages (or Messaging if you have stock Android) in the list. Click Memory and select Clear Cache. If the problem is not resolved, you can try Clear All Data, but make sure to back up important correspondence before doing so, as they can be deleted.

Once the data is cleaned, the app will return to factory settings, you will have to re-allow contacts and phone access if the system requests it on the first run, an action that often helps if the failure is caused by a firmware update that conflicts with the messenger's old configuration files.

• 🗑️ Clearing the cache only deletes temporary files without affecting the text of messages.
• ⚙️ Application data reset returns settings to factory values.
• 🔒 After the data reset, you will need to re-give permissions to access contacts.
• 📲 Make sure the Messages app is installed as the default app.

Checking the number of the message center (SMSC)

One of the most technical and often overlooked reasons is an incorrect SMSC (Service Message Service Center) number, which is the address of the operator gateway through which all your SMS passes. If the phone settings change or erase that number, messages cannot physically be delivered to the operator, even if the network works perfectly.

To check and change the message center number, open the Messages app, click on the three dots in the top right corner and select Settings. Next, look for "Additional" or "Service Numbers" (location may vary depending on the version of MIUI). There should be a message center number. Compare it to the number on your carrier's official website.

If the number is incorrect, correct it manually. In some cases, the field may be blocked for editing, then resetting the network settings to factory values will help, and you can also use the engineering menu by typing the code ##4636## on your phone, going to Phone Information and finding the field "SMSC", here you can update the number with the "Update" or "Set" button.

⚠️ Warning: Be extremely careful when changing the settings in the engineering menu. SMSC, This could cause a total loss of communication or unstable operation of your Xiaomi radio module.

Conflicts of third-party applications and antiviruses

Android system allows you to install third-party applications to work with SMS, If you have recently installed a new launcher, antivirus or spam blocking app, the problem may be in them. Aggressive memory cleaners can block the system process. sms_service.

Try temporarily disabling or removing newly installed apps, especially those that require access to your messages and contacts. Often users install "phone speed" apps that shut down the processes needed to send data in the background. Check the permission list in the privacy settings.

Also, you should pay attention to work in safe mode. Downloading in this mode turns off all third-party applications. If in safe mode SMS is sent normally, then one of the applications you installed is to blame. Entering safe mode on Xiaomi usually takes place on the off buttons on the screen before the corresponding offer appears.

Some number-defining applications (definitions) can intercept control SMS-Make sure that the settings of the App are → Access management → Other permissions for suspicious programs do not have the rights to read and send messages. MIUI There is also built-in protection that can block the sending if the application appears suspicious to the system.

System Errors and Network Resetting

If simple methods didn't work, maybe the problem lies in deep network system settings. Android has a network reset feature that returns Wi-Fi, Bluetooth and mobile settings to factory values. This won't delete your personal files, photos or contacts, but it will forget Wi-Fi passwords.

To perform the reset, go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. Click Reset button at the bottom of the screen. Once the phone is restarted, the system will reconfigure the APN access points and operator network settings. This often resolves problems that have arisen after a failed firmware update.

In extreme cases, if even a reset doesn’t work, you can try to remove updates to the Messages app itself. Go to the Google Play or GetApps store, find the app, and click “Delete” (if available) or “Return Updates” in the app menu in your phone’s settings, which will return the factory version of the program that is guaranteed to be compatible with your version of MIUI.

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Network resets are the middle ground between a simple reboot and a complete phone reset.It is secure for personal files but effectively eliminates communication software errors.

Frequently Asked Questions (FAQ)