COM Service on Xiaomi: purpose, functions and management of system service

Owners of smartphones, smartwatches and other Xiaomi equipment often face unknown system processes in the list of applications or task manager — COM The name sounds technical and raises questions: what kind of service is it, why it works in the background and whether it can be turned off without harming the device?

Actually. COM Service is not a virus or superfluous software, but an important component of firmware MIUI, It's a device that's responsible for the interface between hardware modules and the software shell, and its tasks vary depending on the device model: on smartphones, it can control sensors, and on smart watches, the Mi Band or Xiaomi Watch, it can synchronize data with the Mi Fitness app. In this article, we will discuss in detail what is hidden behind this name, how to check its operation and what to do if the service begins to “load” the system.

What is it? COM Service in Xiaomi devices

COM Service (from English Communication Service) is a system process built into firmware MIUI and other proprietary Xiaomi OS (e.g. HyperOS), its main function is to provide interaction between the two:

• 📱 Hardware components (sensors, communication modules, accelerometer, etc.)
• 🖥️ Software shell (MIUI, HyperOS)
• 🔄 External services (Mi Cloud, Mi Home or Mi Fitness)

For example, when you raise your hand to your smartphone to watch the time, it is the time you have to look at it. COM Service transmits a signal from the proximity sensor to the screen and activates the backlight. In Xiaomi smartwatches, this service is responsible for synchronizing steps, pulse and notifications with the phone.

It is important to understand that COM Service is not a single application, but a set of microservices that run on demand, so you can see several processes with similar names in Task Manager (e.g., com.xiaomi.commservice or com.miui.commservice).

What devices Xiaomi has on COM Service

Service COM Service is present in almost all Xiaomi devices, but its role and name may differ:

On some devices (for example, in a ruler) POCO) It might be called something else, like com.poco.commservice, but it's the same thing. COM The Service can be integrated into other system processes, such as com.miui.system or com.android.server.telecom.

If you didn't find it in Task Manager, it doesn't mean it doesn't exist. It might be hidden under a different name, or it might be running in the background without displaying it in the interface. ADB (We'll tell you about them below).

Why do you need it? COM Service: main tasks

Functional COM Service depends on the type of device, but you can highlight a few universal tasks that it performs on most Xiaomi gadgets:

• 🔄 Data synchronization: transfer of information between the device and the Mi Cloud (contacts, notes, photos).
• 📡 Connection management: working with Bluetooth, Wi-Fi, NFC mobile.
• 🔋 Optimizing energy consumption: controlling battery consumption by background processes.
• 🛡️ Security: Interaction with the unlock system (Face Unlock, fingerprint).
• 📱 Work with sensors: accelerometer, gyroscope, light sensor, etc.

For example, when you use the Always-On Display feature on a Xiaomi smartphone, COM Service is responsible for correctly displaying time and notifications in sleep mode, while saving battery power. In the Mi Band smartwatch, this service provides data on physical activity to the Zepp Life application (formerly Mi Fit).

No COM Service many functions MIUI They just stop working:

• ❌ No synchronization of call history with Mi Cloud.
• ❌ Notifications will stop coming to the smart watch.
• ❌ You may miss the ability to unlock your face or fingerprint.

💡

After the update MIUI sensors stopped working (for example, automatic brightness control), try to clean the cache COM Service through application settings. This often solves the problem without resetting the device.

Can I disable or remove COM Service

Technically turn off COM Service is possible, but it is highly discouraged. This service is deeply integrated into firmware, and deactivation can lead to the deactivation of the service:

• 🚨 Loss of functionality: sensors, synchronization, notifications will stop working.
• 🔄 Unstable system operation: accidental reboots, errors in the interface.
• 🔋 Increased battery consumption: Other processes will try to compensate for the lack of service.

If COM Service is heavy on processor or battery, try the following steps first:

Clear the cache of the service in the application settings|Reset the device|Update firmware MIUI last-minute|Reset network settings (if the problem is connected)|Perform reset to factory settings (in extreme cases)-->

If you want to disable the service, you can do it in two ways:

1. Through ADB: adb shell pm disable-user --user 0 com.xiaomi.commservice ⚠️ Note: After this command, the basic functions of the phone, including calls and phone calls, may stop working. SMS. To get it back, use: adb shell pm enable com.xiaomi.commservice
2. Root Access: Apps like Titanium Backup can “freeze” the service, but this requires unlocking the bootloader and potentially depriving you of warranty.

⚠️ Note: On some devices (e.g. Xiaomi 13 Ultra or Redmi) K60) shutdown COM Service can cause a total loss of communication with the mobile network, because the service manages the module. IMS (IP Multimedia Subsystem, responsible for VoLTE and VoWiFi.

How to check the work COM Service

If you suspect that COM Service is not working properly (e.g., battery is running out quickly or data is not synchronized), follow the following steps to diagnose:

1. Checking in Task Manager

Open the Settings. → Annexes → Task Manager and find processes with names:

• com.xiaomi.commservice
• com.miui.commservice
• com.xiaomi.midrop (if any)

Pay attention to:

• 📊 Consumption CPU (should be no more 5-10% down-to-earth).
• 🔋 Battery consumption (normally up to) 3-5% hour of active use).
• 🕒 Working time (if the process hangs in the background constantly, it is normal).

2. Verification of system logs

For advanced users: connect the device to your PC and use the command:

adb logcat | grep -i "commservice"

This will show errors related to COM Service. If there are many messages in the logs E/Commservice: Failed to connect, the service may conflict with other software.

Functionality test

Make sure that the following work:

• 🔄 Sync with Mi Cloud (check in Settings) → Xiaomi Account → Mi Cloud).
• 📶 Mobile network and calls (especially VoLTE).
• 🔑 Face unlocking/imprinting.

If something on this list doesn’t work, the problem may be COM Service or related modules.

COM Service and Security: Myths and Reality

Some users are mistakenly thinking COM Service spyware or virus. Let's see if that's true:

• 🔍 It's not a virus: it's built into firmware and signed with a Xiaomi digital signature. APK-analyzers (e.g, JADX).
• 📡 He's not "leaking" the data: COM Service only transfers information to Mi Cloud (if you have given permission) and does not send it to third parties.
• 🔒 It can be limited: in the settings MIUI You can turn off sync for individual data (for example, call histories).

But there are nuances:

• ⚠️ On devices for the Chinese market (with firmware China) ROM) COM Service can collect more data for analytics. If that's critical, install Global. ROM or EEA ROM.
• ⚠️ Old versions. MIUI (Up to 12.5), the service could send anonymous statistics without the user's explicit consent.

If you are concerned about privacy, follow the following steps:

1. Open the Settings. → Memory. → Annexes → COM Service → Permissions and disable unnecessary (e.g. access to contacts).
2. B Settings → Xiaomi Account → Mi Cloud Select Which Data to Sync.
3. Use it. ADB, To disable analytics collection: adb shell settings put global send_action_app_data 0

⚠️ Note: On some devices (e.g. Xiaomi) 12S Ultra) disabling permissions for COM Service can result in loss of camera functionality (service manages image processing in the background).

COM Service on smart watches and fitness bracelets Xiaomi

In wearable devices (Mi Band, Xiaomi Watch) COM Service is even more important than smartphones, and it's where it's in charge of the system:

• 🔄 Synchronization with your phone via Bluetooth.
• ❤️ Health monitoring (pulse, blood oxygen levels, sleep).
• 🔔 Notifications (calls, SMS, messenger).
• 🏃 Tracking activity (steps, calories, exercise).

If the Xiaomi watch stopped receiving notifications or data is not synchronized, the problem most often lies in the presence of a new device. COM Service, here's how to fix it:

Reconnect your watch to your phone via Zepp Life|Update the firmware of the watch (in the Zepp Life app) → «Device profile» → «Update of the PO»)|Clean the Zepp Life app cache on your phone|Restart the clock (hold the power button for 10 seconds)|Reset the clock to factory settings (in extreme cases)-->

Some models (e.g. Xiaomi Watch) S3) COM The service also manages:

• 🎶 Music Management (pause, next track).
• 📸 Remote photography (setting the shutter of the phone camera).
• 🔦 Search for the phone (the function "Find the device»).

If after updating the firmware clock COM Service has started to behave unstable, try to roll back to the previous version of the software:

1. Download the old firmware from the Xiaomi Firmware website.
2. Place the file in the root of the memory of the watch (via Mi Fitness or Zepp Life).
3. In the application, select "Update Software» → «Local Update».

FAQ: Frequent questions about COM Service