Xiaomi activation service SIM: Why it works, how it works, and can it be removed from Android?

If you’ve ever looked into the list of running processes on a Xiaomi, Redmi or smartphone POCO, I’m sure you’ve come across the mysterious name of Xiaomi Activation Service. SIM» (Xiaomi SIM Activation Service: This system service appears on the app menu, consumes battery life, and sometimes even issues notifications — but its purpose remains unclear to most users.

Some Xiaomi device owners suspect it's spyware or junk that you can safely disable. Others fear that removing the service will lead to problems with mobile communications. Is that true? In this guide, we'll go into detail about what Xiaomi is? SIM Activation Service, how it affects the phone and whether it needs to be done.

Spoiler: 90% of the time, it's not a threat, but there are nuances to be aware of, especially if you're using a two-way device. SIM-Cards or travel abroad frequently.

What is Xiaomi? SIM Activation Service and why you need it

Xiaomi SIM Activation Service is a system application that is responsible for automatic activation and configuration. SIM-cards in smartphones Xiaomi, Redmi and POCO. It's built into the firmware. MIUI and works in the background, interacting with mobile networks of operators.

The main functions of the service:

• 📶 Rapid activation SIM — Speeds up the process of connecting to the network when you first install the card or after restarting the phone.
• 🔄 Automatic profile switching – helps the device adapt to different communication standards (2G/3G/4G/5G) depending on the coverage.
• 🌍 Roaming support – optimizing work SIM-Cards abroad, preventing connection problems.
• 📱 Dual Management SIM — Coordinating the work of the two SIM-Cards (if installed) to prevent conflicts.

The service appeared MIUI 10 and since then regularly updated. In new versions of the firmware (starting with the MIUI 12) it has become more "invisible" but still present in the system.

But there is a downside to the service: it can consume battery (especially on older devices) and sometimes produce errors when working with certain operators. Tele2 Yota complains of periodic activation failures.

How to check if the service is installed on your phone

Make sure Xiaomi is available SIM Activation Service can be done in a number of ways. The easiest way is to look at the app list:

1. Open Settings → Applications → Application Management.
2. In the top corner, press three dots (⋮) and select Show all applications.
3. In the search box, enter SIM Activation or activation SIM.
4. If there is a service, you will see it in the results with the gear icon.

Alternative method - through settings → The phone. → Version. MIUI:

• Tap 5-7 times on the MIUI version to activate the developer mode.
• Back to Settings → Additionally. → For developers.
• Find the Working Apps section and check if there is a com.miui.simactivate process.

On certain devices (e.g, POCO F3 Redmi Note 10 Pro may be a different name for the service — MIUI SIM manager or SIM Toolkit. If you don't find it through a search, try using apps like App Inspector (available on Google Play).

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On devices with pure Android (for example, Xiaomi 13 Ultra on global firmware), this service may not be available – its functions are performed by the standard Telephony Framework from Google.

Impact of service on productivity and battery

One of the main concerns of users is resource consumption. SIM Activation Service can consume up to 3-5% of battery life per day (according to tests on the Redmi Note 9 Pro and the newest model). POCO X3 NFC). However, this is only true in three cases:

• 🔋 You're using two. SIM-mapping.
• 📡 Frequently switch between networks (for example, in the subway or outside the city).
• 🔄 You have an outdated version installed. MIUI (below MIUI 12.5).

On new devices (e.g. Xiaomi) 12T or Redmi K50) It's optimized and has little impact on autonomy. 9A or POCO M3 His work may be more visible.

In terms of performance, the service takes an average of 50 to 80 MB of RAM and does not load the processor. SIM-cards (usually associated with a conflict with the firmware operator).

⚠️ Note: If the service consumes more than 10% of the battery per day or constantly hangs in the top of the processes for loading on the battery CPU — This is a sign of a failure, in which case it is recommended to reset the network settings (Settings). → SIM-maps and mobile networks → Resetting settings).

Can you remove or disable Xiaomi? SIM Activation Service

Technically, it is not recommended to remove the service, as this can lead to problems with:

• 📵 Activation of new SIM-Cards (the phone will not be able to connect to the network).
• 🔄 Dual's job SIM (One of the cards may not be determined).
• 🌐 Roaming (in some countries, the phone will not be able to automatically connect to local networks).

However, there are safe ways to reduce its activity:

Turn off automatic activation SIM|Limit background activity|Update MIUI last-minute|Reset the network settings

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Method 1: Disabling Automatic Activation

1. Go to Settings. → SIM-maps and mobile networks.
2. Choose yours. SIM-Deactivate the Automatic Activation option (if any).
3. Reboot the phone.

Method 2: Limiting background activity

1. Open Settings → Applications → Application Management.
2. Find it. SIM Activation Service and tap on it.
3. Choose the Battery. → Limit background activity.
4. Also turn off AutoRun.

Method 3: Remove via ADB (for power users)

⚠️ Warning: This method can disrupt mobile communications, and only use it if you are confident in your actions and prepared for the consequences.

adb shell pm uninstall --user 0 com.miui.simactivate

Once you have completed the command, restart your phone. If you have a network problem, return the service to:

adb shell cmd package install-existing com.miui.simactivate

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On most devices, it is enough to simply limit the background activity of the service – this is enough to reduce battery consumption without risk to communication.

Frequent problems and errors related to the service

Despite the usefulness, Xiaomi SIM Activation Service sometimes becomes a source of headaches. Here are the most common problems and solutions:

1. Mistake «SIM-card not activated»

Symptoms: The phone doesn't catch the network, although SIM-card.

Reasons:

• 🔌 Conflict with the firmware operator (often occurs in the Tele2 yota).
• 📱 An outdated version MIUI (below 12.5).
• 🔄 Failure of the service after the update.

Decision:

1. Reboot the phone.
2. Update MIUI to the latest version.
3. If it doesn't help, take it out. SIM-card, clear the contacts and paste back.

2. Permanent notifications “Activation” SIM-map…»

Symptoms: Every 5-10 minutes, a pop-up prompts you to activate the device. SIM.

Reason: Service failure or conflict with an operator’s application (for example, My MTS).

Decision:

• Disable notifications for the service in Settings → Annexes → SIM Activation Service → Notifications.
• Remove or update your carrier’s app.

3.The phone doesn't see the second SIM-map

Symptoms: One of SIM-The card is not defined, although physically installed.

Reasons:

• 🔌 Conflict between the activation service and the Dual module SIM.
• 📱 Slot damage SIM-map.

Decision:

1. Go to Settings. → SIM-maps and mobile networks and manually select a priority network for each SIM.
2. Reset network settings (Settings) → SIM-maps and mobile networks → Resetting settings).
3. If it doesn’t help, check the slot. SIM-lesions.

4.Fast battery discharge due to service

Symptoms: Xiaomi SIM Activation Service consumes >10% charge per day.

Reasons:

• 🔋 The service constantly scans networks due to poor coverage.
• 📡 Conflict with user firmware (e.g. Custom) ROM).

Decision:

1. Limit the background activity of the service (see section above).
2. Turn off automatic network search in Settings → SIM-maps and mobile networks → Networking.
3. If you use Custom ROM — Check compatibility with your model.

Alternatives and analogues of service on other phones

Xiaomi SIM Activation Service is not a unique product, and other manufacturers have similar solutions:

Interestingly, Apple does not have a separate service to activate. SIM — All features are integrated into iOS Core Telephony, which explains why iPhones are less likely to experience carrier change problems.

If you are moving from Xiaomi to another brand (such as Samsung), you don’t have to worry about these services – they work more stable and less noticeable to the user.

Myths and truths about Xiaomi SIM Activation Service

There's a lot of rumors going around this service, and we're going to look at the most popular ones.

Myth 1: This is a spyware that collects call data.

✅ The truth: the service does interact with the mobile network, but does not record calls or SMS. Its only job is to ensure a stable connection to the operator, Xiaomi confirmed in an official statement in 2021.

Myth 2: If you delete the service, the phone will stop catching the network.

⚠️ Part of the truth: On new devices (c) MIUI 13+) The phone will work without service, but there may be problems with the:

• 📵 Automatic activation of new SIM.
• 🔄 Switching between 4G and 5G.
• 🌍 Roaming in some countries.

Myth 3: The service is only for Dual SIM.

❌ It is also useful for phones with one SIM-card, as it speeds up network connection after rebooting or signal loss.

Myth 4: It can be completely replaced by a third-party app.

❌ Truth: No analogues that would completely duplicate the functionality, SIM Card Managers can only show information about SIM, but not to control activation.

Myth 5: The service is to blame for the bad signal.

⚠️ Part of the truth is that the service itself doesn't degrade the signal, but if it doesn't work properly, it can slow down the switching between towers.

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FAQ: Frequent questions about Xiaomi SIM Activation Service