Xiaomi smartphone owners, especially the Redmi Note 9 Pro, often face an intrusive audible alert when recording a phone call, a feature introduced by the developers of the MIUI shell to comply with privacy regulations, but for many users it becomes a serious irritant.
There is a common misconception that it is impossible to completely remove this warning with regular means without flashing the device. In fact, depending on the version of the operating system and regional settings, various methods of circumventing the restriction are available. In this article, we will discuss in detail ways to minimize discomfort or completely disable the audio recording process on your gadget.
It is important to understand that the methods may vary depending on which version of Android and MIUI is installed on your Redmi Note 9 Pro. Some methods require changing regional settings, others involve using third-party applications, and others are based on specific codes of the engineering menu.
Causes of sound signal during recording
The main reason for the high-profile notification is a legal requirement: in many countries, the law strictly regulates the recording of telephone conversations, requiring the notification of the second party to record a conversation. Xiaomi, following these rules, implemented a forced audio notification in the regular call (the phone application), this is done to protect the rights of users and prevent illegal information collection.
However, the implementation of this feature on the Redmi Note 9 Pro is often controversial: the sound is played through the speaker of the interlocutor, not just through the vibration response or a quiet signal on the owner's device, which creates the feeling that the phone "screams" about recording to the whole room.
⚠️ Note: Disabling system alerts completely may violate local data protection laws. Use the described methods only for personal purposes and subject to the legal regulations of your country.
In addition, the behavior of the system can change after updates. While earlier versions of MIUI had loopholes to turn off sound, in new security patches Android 11 and higher access to the microphone by third-party applications and system recording functions is strictly controlled, which is why there is no universal button “turn off sound” and you have to resort to workarounds.
Change of region in smartphone settings
One of the easiest and safest ways to change the behavior of a system is to change the region in the device settings, the logic being that different countries have different laws on recording conversations, and in some regions (for example, India or Indonesia), the requirements may be less stringent or the implementation of the feature may be different from the European or Russian version.
To do this, go to the settings menu. Find the Additional Settings section and select Region. In the list that opens, try to select a country other than your current one, such as Singapore, Vietnam or Indonesia. Once you change region, the phone may reboot some services, and the behavior of the Phone app will change.
Note that this method doesn’t work on all firmware versions. In the latest updates to MIUI 13 and MIUI 14, Xiaomi has unified the behavior of the system regardless of the region chosen. However, for owners of the Redmi Note 9 Pro with older versions of the software, this method often proves to be effective. If the change of region did not help, the sound will remain the same, and you will have to look for other solutions.
However, the basic functions of calls and messages are not usually affected, and once the record is checked, you can return the region back, but the recording settings can be reset.
Use of third-party applications for recording
If Xiaomi’s regular tools don’t allow you to remove annoying sound, the logical solution is to install alternative software. Third-party applications for recording conversations often have their own audio capture mechanisms that can bypass system limitations or mask the recording process.
One popular solution is the Call Recorder app, ACR or TapeACall, which asks for access service, which allows them to intercept call control, and in the settings of these applications, you can often find the option "Hide notification" or "No sound", which allows you to record without the characteristic click or voice message.
☑️ Criteria for selecting an application for recording
However, with the release of Android 11 and higher, Google has significantly limited the ability of third-party apps to access the audio stream during a call. Many programs now record silence or require complex manipulations with the turn on of hands-free. On the Redmi Note 9 Pro, the situation may be better thanks to customization from Xiaomi, but it is impossible to guarantee the operation of a particular application without experimentation.
When installing third-party software, be mindful of the permissions requested. Apps that require access to contacts, microphone and phone can potentially access your personal information. Choose only proven products that rank highly on Google Play and read the latest user reviews to make sure the program is up to date.
Configure through the engineering menu and codes
For more advanced users, there is the possibility of accessing hidden system settings through an engineering menu, a special interface designed to test hardware, but sometimes containing useful options for fine-tuning sound and recording. It is accessible through a set of special USSD-codes in the appendix "Telephone".
Try entering the following codes (not all firmware): ##3646633## or ##4636##. If the menu opens, you should find a section associated with Audio or Debug. Inside, there may be an option responsible for Record Tone or similar. Disabling this option can remove the audible warning.
| Code. | Description of function | The probability of success on the Redmi Note 9 Pro |
|---|---|---|
| ##3646633## | Engineering Menu (CIT) | Medium (depending on the version of MIUI) |
| ##4636## | Menu testing information | Low (rarely contains audio settings) |
| ##6484## | Equipment Inspection (CIT) | Low (iron tests only) |
Be very careful when changing the parameters in the engineering menu. Incorrect frequency settings or disabling critical services can lead to unstable model operation or loss of communication. It is recommended to remember the original values of the parameters before making changes to return everything as it was if necessary.
What if the code doesn't work?
Modification of system files (Root Requires)
The most radical and effective method is to obtain superuser rights (Root) and modify system files, which allows you to directly delete or modify the audio file that is played when you start recording, but it requires technical training and carries the risk of losing warranty or "filling" the device in case of errors.
To implement this method, you need to unlock the bootloader (Bootloader) and install custom recavers (for example, TWRP), Then you can get the Root permissions through Magisk, and then you can use a root file manager like Root Explorer to find the file that's responsible for the sound of the recording. /system/media/audio/ui/ or a name like record_start.ogg.
Once the file is found, it can be renamed, deleted or replaced with an empty audio file (silence).After the reboot, the system will try to play the notification, but, failing to find the file or finding silence, it will skip this step. This guarantees 100% audio shutdown, but makes the device vulnerable to system integrity checks (SafetyNet), which can disrupt banking applications.
⚠️ Warning: Unlocking the bootloader and obtaining Root rights on the Redmi Note 9 Pro will officially void the warranty, and it also increases the risk of malware infection, as system protections will be weakened.
If you're not sure about your abilities, you should avoid this method, because editing system partitions can cause the phone to reboot cyclically, and you'll need to flash the device through the computer and delete the data completely, which is a time-consuming process.
Alternative solutions and workarounds
If none of the software methods worked, you can consider physical or behavioral ways to minimize discomfort, such as using a headset, and when wired or Bluetooth headphones are connected, the warning sound can only be transmitted to them, remaining inaudible to others if you are not in hands-free mode.
Another option is to use hands-free mode, followed by a quick turn down of volume, which, while it doesn't eliminate the fact of the notification, it allows you to control the moment it is played, and you can also try to turn on the "Do Not Disturb" mode before calling, although this rarely affects the system sounds of the recording.
Some users have resorted to installing global firmware (Global ROM) instead of Chinese or Indian (China ROM/India ROM). Global versions often have slightly different set of rules and privacy settings. However, flashing from one region to another (e.g., Global to Russia) usually does not change the recording behavior, as this is governed by the Google GMS layer and the basic Xiaomi policy.
It is also important to keep an eye on system updates: sometimes in new security patches, Xiaomi changes the logic of how applications work, and in the future, there may be an official setting to turn off the sound in certain scenarios, for example, when recording your own contacts.
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The safest and most stable way to avoid sound is to use a headset or change the region, whereas Root rights give full control, but carry high risks to the stability of the system.