The situation when Xiaomi smartphones stop receiving confirmation codes or transaction notifications from Sberbank is one of the most common complaints of users. This is not just a technical problem, but a critical problem that blocks access to online banking and the ability to make purchases online, and most often it is not a failure on the part of the operator or bank, but rather an aggressive algorithm for energy saving the operating system. MIUI or hyperos.
Chinese Android shells, including Xiaomi, Redmi and POCO, are known for their strict background management policies. The system can force the Messages app or the banking service itself to stop working, thinking it's battery draining. As a result, you wait for the code to appear, but it never appears on the screen, even though other family members or older devices are working properly. Understanding how the task manager in your version of the firmware works is the first step to solving.
In this article, we will look at all the possible causes of the lack of SMS and propose a step-by-step algorithm for actions. We will touch not only on standard settings, but also on specific spam protection features that often block short bank numbers by mistake.
Checking blockings in the Messages and Anti-Spam application
The first place to look in the absence of messages from Sberbank is the built-in spam filter. Xiaomi owners often do not even suspect that their phone automatically sends important notifications to a hidden folder. MIUI Security algorithms can mistakenly classify short numbers (for example, 900) as spam or promotional mailings, especially if the user has previously marked such messages as unwanted.
To check this out, open the standard Messages app and look for a menu icon or filter settings, usually a shield icon or a three-dot menu in the corner of the screen, and there's a "Blacklist" or "Blocked" section, and if you see messages from the bank, you've solved the problem, you just need to unlock the number.
Also, check the settings of the Security app itself. From the Antispam menu → Blacklist → Settings make sure you don’t check the box to block all messages from unknown numbers or short service numbers. Sometimes, a system update resets these settings to more stringent ones.
- 📱 Open the Messages app and check the Spam or Blocked folder».
- 🛡️ Go to Security» → «Antispam and check the history of blocking.
- ⚙️ In the blacklist settings, disable the short number lock.
- 📞 Add 900 to the list of contacts with the name “Sberbank” so that the system considers it a trusted one.
⚠️ Note: If you use a third-party SMS application (e.g. Google Messages or Textra), the built-in Xiaomi filter may conflict with it. MIUI Messaging to check for.
Remember that some firmware versions have a Smart Message feature that tries to sort notifications. Try turning it off in the messaging settings of the app to see if all the messages are in the common thread, which will help you see if the message is coming or going to be lost at the system level.
Notification and energy saving settings MIUI
The most technically complex and common cause of problems is aggressive energy saving. HyperOS and older versions of MIUI aim to extend battery life by forcibly killing background processes. The SMS app, or Sberbank Online itself, can be stopped by the system before it can display a notification or process an incoming packet of data for a push notification.
You need to manually prioritize important applications. Go to Settings → Apps → All apps. Go to Messages (or your SMS app) and go to Battery Savings. Select No Limits. This will prevent the system from stopping the application.
The same procedure is required for the Sberbank Online application, even if SMS is sent via the operator, push notifications from the bank can be blocked. Open Settings → Notifications and Status bar → Notification Management. Find the bank application and make sure that all switches are active, especially “Important” and “Sound”.
Pay special attention to the Advanced Settings feature in the notification menu, where the Display on the Lock screen may be hidden, and if it is disabled, you won't see the message until you unlock the phone and open the app, which is critical for financial transactions.
- 🔋 Set the “No Limits” Power Saving Mode for the Messages app».
- 🔔 Include priority display of notifications for Sberbank in the system settings.
- 📲 Allow auto-run of messaging apps and bank in the Security menu».
- 🔒 Check if Do Not Disturb or Focus mode is enabled to block notifications.
⚠️ Warning: After a firmware update, the energy saving settings are often reset to standard (strict.
Sometimes cleaning the app cache helps. In the app menu, click Clear Data → Clear Cache. This won’t delete your correspondence, but it can fix bugs in the notification service. If the problem persists, try removing Messages app updates through the three-point menu and updating it again via Google Play or GetApps.
Problems with SIM-map and network settings
If the software settings are in order, the problem may lie in the physical layer or network configuration. Xiaomi smartphones sometimes do not work properly with certain carrier network profiles, especially if the phone is not a good fit. SIM-The map has been in use for years and hasn't changed. SIM-Cards may not support new encryption protocols that are required for fast delivery of SMS on networks 4G/LTE.
Try to get it out. SIM-If you have a two-sym phone, you can just wipe the contacts with a soft dry cloth and put them back in. Make sure the card sits tightly in the slot. If you have a two-sym phone, try moving the SIM card to another slot in a crash. Sometimes one of the modem modules is unstable.
An important step is to reset the settings of the access point (APN). Although this is more likely to affect mobile internet, incorrect network settings can prevent normal registration on the network to receive service SMS. → SIM-maps and mobile networks → Choose. SIM → Access points (APN).
☑️ Diagnostics SIM-map
In the access point menu, click the menu (three dots or reset button) and select Reset. Then reset the phone, which will return all network settings to the factory values recommended by the operator.
| Symptoms. | Possible cause | Action. |
|---|---|---|
| No text, but the calls are coming. | Blocking short numbers | Check the blacklist and anti-spam |
| There's no connection. | Incorrect APN settings or network failure | Reset network and APN settings |
| SMS is coming with a delay | Network overload or energy saving | Turn off energy savings for SMS |
| Delivery error | Message memory is overflowing | Clean old SMS and app cache |
If you have two on your phone. SIM-card, make sure that the default card is the one that is tied to the bank for data transfer and SMS, and in rare cases, a priority conflict leads to the fact that the SMS comes to the currently inactive card and is lost.
Third-party application conflicts and access rights
Often users install various “improvers”, memory cleaners or alternative launchers that interfere with the system. Applications like Clean Master, Du Battery Saver or even antivirus from other vendors can conflict with Xiaomi system services, they can intercept the management of notifications and block them.
Check the list of installed apps. If you recently installed an “optimizer”, try to remove it. It is also worth checking the access rights. Go to Settings → Privacy Protection → Permissions Manager → SMS. Make sure that the Messages app has permission to read and send SMS, and (if necessary) access to contacts.