Modern smartphones, including the flagship Xiaomi Mi 9, offer a variety of ways to communicate, from instant messengers to video calls. However, classic text messages remain an indispensable tool for confirming transactions, obtaining access codes and communicating in areas of weak Internet coverage. Despite their apparent simplicity, users often encounter the nuances of the MIUI interface, which can cause difficulties when first familiarizing with the device.
In this article, we will discuss in detail the process of sending messages, starting with the basic settings of the SIM card and ending with advanced spam blocking functions. SIM-A map to get messages to leave the right number, and how to avoid common bugs associated with shell software failures, and understanding these processes will ensure stable communication in all environments.
Special attention should be paid to security and filtering, as the Xiaomi Mi 9 has powerful built-in protection tools against unwanted content. Properly configuring these settings will allow you to focus on important correspondence, eliminating unnecessary notifications.
Primary setting SIM-Maps and annexes Messages
Before sending the first message, you need to make sure that the device correctly recognized the installed SIM-Xiaomi Mi 9 owners often use two SIM cards at the same time, so the system requires clear prioritization for voice calls and mobile Internet. By default, the Messages app can try to use a card that does not charge. SMS or there is no balance, which will lead to a sending error.
To check, go to the Settings menu → SIM-It's important to make sure that sliders are active for both cards if they're installed. In the Default section, select your preferred SIM card to send messages, although in modern versions, MIUI It can request a number at the time of writing, and this flexible management allows you to save money by choosing a tariff with free ones. SMS specific contact.
⚠️ Note: If after installing a new SIM-Message cards are not sent, try restarting the device. In rare cases, the Xiaomi Mi 9 communication module requires re-initiation of the network to work correctly with the new operator.
The standard MIUI text messaging app is simply called Messages, and has a bubble icon that combines regular SMS and carrier network (RCS) messages if your provider supports it. To get started, open the app and click on the new message creation button, usually located at the bottom right of the screen.
☑️ Checking readiness for dispatch
The process of creating and sending a message
The message creation interface in Xiaomi Mi 9 is intuitive, but it has a few hidden features that speed up the work. When you press the new message creation button, you open a field to type in the number or contact name. The system offers autocomplete from your phone book, which minimizes the risk of error when dialing long numbers. You can start typing the name, and a smart search will tell you the right subscriber.
The text input box provides standard editing features, as well as quick access to emojis and multimedia attachments. To add a photo or video, click on the clip or camera icon in the input bar. When you send multimedia content, the message is converted to MMS format, which may require you to pre-configure the APN hotspot if it does not happen automatically. Usually, the Xiaomi Mi 9 receives these settings from the operator immediately after you register with the network.
When you type and the recipient is selected, press the send button. SIM-If you don't have the default card, the system will ask you which number to send a message from, which is critical because sending from the wrong number can lead to unnecessary costs or confusion. Visually, the sending process is displayed by the status "delivered" under the message.
💡
Use voice input to quickly dictate long messages. Press the microphone on the keyboard and clearly pronounce the text - MIUI is great at recognizing Russian.
It's worth noting that the latest MIUI updates have included a feature called "Smart Messages," which automatically sorts incoming categories: personal, notifications and transactional. This helps keep the main dialogue clean. Sending a response message in such branches is standard, but it's important to make sure that the response does not go into the general notification category if you want the interlocutor to receive it as a personal SMS.
Double SIM settings and default number selection
The two-sim card management on the Xiaomi Mi 9 is flexible enough to assign different cards for different tasks. In the device settings, you can set a permanent SIM card to send SMS to all contacts, but it is often more convenient to use the "Every Time" number selection, this is especially true if one card is corporate, aay personal, or if the rates vary significantly in the cost of a minute and a message.
To change these parameters, go to Settings → SIM-maps and mobile networks → By default. Here you'll see two main items: "Calls" and "Mobile Internet." SMS A separate global switch may not be available in some firmware versions, as the system often links the send to the card selected for voice calls or asks each time. However, in the menu of the Messages application itself, you can find settings that allow you to clarify the behavior when sending.
| Setup parameter | Description of function | Recommended value |
|---|---|---|
| The Basic SIM for Calls | The default map used for outbound calls | Map with a large pack of minutes |
| Mobile data | Map through which Internet access is provided | Map with unlimited traffic |
| Selecting SIMs when calling | Request a number each time or use the set number | Request (for flexibility) |
| Contact management | Linking a specific number to a contact | Customization individually |
If you often send messages to a certain group of people from a particular number, it makes sense to keep those contacts tagged or in a separate group. While MIUI does not allow you to rigidly link the SIM number to a specific contact at the system level for all scenarios, using tags and groupings helps you quickly navigate. When choosing a recipient from the list, the system can remember your last choice for that subscriber.
Multimedia Messages (MMS)
Sending photos, videos and audio files through a standard messaging application is done via MMS technology. Unlike conventional SMS, this process requires an active connection to the mobile Internet. Even if you are connected to Wi-Fi, the Xiaomi Mi 9 MMS can temporarily switch to mobile data to transfer. This is standard protocol behavior and cannot be changed without the use of third-party converter applications.
When you try to send a large file, the system can warn you that it is compressed. Image quality when transmitted via MMS is often reduced due to protocol limitations and operator tariffs. If you want to maintain original quality, you should use messengers or cloud storage. However, for fast transfer of screenshots of documents or low-resolution photos, MMS remains a convenient tool that does not require additional software installation.
You can find the MMS size settings in the app's menu. Click on the three dots in the top right corner and select Settings. You can limit the maximum file size to avoid accidentally sending heavy videos that can take a long time to load from the recipient or cost a lot to roam, and you can set up a delivery report, which is useful for monitoring important messages.
⚠️ Attention: Make sure that roaming data is allowed in the mobile network settings if you are abroad.Submit MMS Abroad without connected tariff can lead to significant write-offs.
Blocking Spam and Setup a Blacklist
The problem of intrusive advertising and spam is a pervasive issue for all smartphone users, and the Xiaomi Mi 9 offers powerful built-in tools to combat them.The Antispam system is built directly into the Security app and integrated with the phone and messages.It automatically recognizes known numbers of scammers and advertising agencies, marking them red or completely blocking them.
To activate and configure, open the Security app (green shield icon) and select Antispam, where you can block hidden numbers, numbers from other regions, and even entire prefixes. The malicious number database is regularly updated over the Internet to protect against new threats. You can also manually add numbers to the blacklist if you receive unwanted messages from specific senders.
In the blacklist settings, you can select the mode of operation: block all calls and messages, block only calls or only messages. All blocked communications do not disappear without a trace - they are stored in a separate log that can be viewed at any time, which makes sure that you did not miss an important message that the system mistakenly classified as spam.
How to recover a message from the blacklist?
Solution: No messages are sent
When a message is “hanging” in the status “Sending” or returns with an error, there can be a number of reasons: the first thing to check the account balance and the presence of the network signal. Sometimes the problem lies in the crowded memory of the phone, because messaging services require free space for data caching.
Another common reason is the incorrectly set date and time: encryption and synchronization protocols with carrier servers require precise time. If the clock on Xiaomi Mi 9 is lagging or in a hurry, the server may reject the request to send. Make sure that the date and time settings activate the "Use Network Time" option.
If simple methods don't work, reset your network settings. This action will return your mobile and Wi-Fi settings to factory values, but it won't delete your personal files or contacts. To do this, go to Settings → Connection and Sharing → Reset Wi-Fi, mobile network and Bluetooth. Once rebooted, the phone will re-register on the carrier's network, and the problem may disappear.
💡
Network reset is a safe and effective way to eliminate programmatic communication errors without affecting the user’s personal data.
In rare cases, the problem may be on the carrier side or in the operation of the message center (SMSC). the message center number is automatically prescribed, but sometimes you need to manually correct it. You can find out the correct SMSC number for your operator on the official website or from the support service. You can enter it in the advanced settings of the message application, although in modern versions of Android this item is often hidden.