Annex “Activation service” SIM Xiaomi: What it is, why it is necessary and how to use it

Introduction: Why Xiaomi is getting an Activation Service SIM»?

If you own a Xiaomi, Redmi or a smartphone POCO, You may have encountered a mysterious activation service application. SIM»** (english. SIM Activation Service: It suddenly appears on the installed program list, sometimes requests permissions, or even blocks access to the mobile network, what service is it, why it's installed on your device, and whether it can be removed?

This system component is part of the firmware MIUI, But it's a questionable question, and some people think it's a virus, others think it's a tool for work. SIM-In this article, we will understand how the activation service works. SIM» Xiaomi, when it activates, what functions it performs and how to safely disable it if it interferes with the phone, and you will learn whether it is associated with network connection problems and how to solve them.

It is important to note that the behavior of this service may differ depending on the region of the firmware (global, Chinese, European versions). MIUI), So there's no universal solution, and you have to understand the nuances.

What is an “Activation Service” SIM» Xiaomi and why you need it?

«Activation service SIM» (com.android.simactivate or com.xiaomi.simactivate is a system application that is built into the firmware. MIUI verb MIUI 12 and later, its main task is to automatically adjust the parameters of the mobile network on the first installation. SIM-It's basically a manual setup, or after you reset your phone to the factory settings. APN (access points that previously had to be entered manually.

The service performs several key functions:

• 📶 Automatic configuration APN — determines the operator and downloads the correct settings for accessing the Internet and MMS.
• 🔄 Activation. SIM-Cards – helps to wake up the card if it is not defined by the network (for example, after buying a new phone).
• 🛡️ Compatibility Check – Analyzes whether your device supports your carrier’s frequency (relevant to Chinese versions of smartphones).
• 📱 Integration with MIUI — synchronize SIM with Xiaomi account for quick recovery of settings when reinstalling firmware.

In practice, the service is most often activated in three cases:

1. First installation SIM-card.
2. After resetting to factory settings (Hard Reset).
3. When changing the operator or updating the firmware MIUI.

However, many users are faced with the fact that the service does not turn off after setting up or starts to work with failures — for example, constantly asking for permissions, blocking mobile Internet or even switching the phone to Emergency Calls Only mode.

Why “Activation Service” SIM» It can block the network or make errors?

After installation SIM-Xiaomi has stopped catching the network or issues an error “No service”, “Emergency Calls Only” or «SIM-This service may be the culprit. Here are the main reasons for the failures:

Another common problem is that the service requires an Internet connection to activate. SIM, But it blocks mobile data itself. This is typical of the Chinese versions. MIUI, And some of the features are tied to Xiaomi servers in China, and that's where it helps:

• 🌍 Connecting to Wi-Fi and trying again.
• 🔧 Manual addition APN (parameters can be requested from the operator).
• 📱 Install global firmware (if you have a Chinese version of your smartphone).

⚠️ Note: If you bought Xiaomi in China or on AliExpress marked “Global Version” but your phone still blocks SIM, You probably have a fake global firmware, and then you'll only get a full Fastboot flashing.

How to disable or remove the activation service SIM» Xiaomi?

If the service is malfunctioning or you don't need it, you can turn it off or delete it.

• 🔹 On global and European firmware, the service can be turned off without consequences.
• 🔹 On Chinese firmware, its removal could lead to network loss after reboot.
• 🔹 On some models (Redmi Note 10 Pro, POCO X3 Pro and newer) service is protected from removal.

Safe way to shut down (without root):

1. Go to Settings → Applications → Application Management.
2. Find the activation service SIM (or SIM Activation Service).
3. Click Disable (if the button is active).
4. Confirm the action and restart the phone.

Removal through ADB (power-user):

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

If the team doesn't work, try:

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

After deleting, check the network. If mobile Internet or calls are missing, return the service back through firmware restoration or resetting.

Make a backup copy. APN (Take a picture of the settings)

Check that you have a global firmware

Make sure that SIM-The card works without service (check on another phone)

Connect to Wi-Fi in case of loss of mobile Internet-->

⚠️ Note: On some models (Xiaomi) 12T, Redmi K50) Deleting this service may result in loss IMEI. If after manipulation the phone stopped catching the network, restore IMEI Use the engineering menu (#4636##) or contact the service center.

What to do if the activation service SIM» He doesn't let you use the phone?

There are times when the service completely blocks the work. SIM-Cards – the phone does not ring, does not send SMS It doesn't connect to the mobile Internet. It happens most often:

• 📱 After updating MIUI (especially in beta).
• 🔄 When changing the operator (for example, from MTS to Tele2).
• 🌐 Chinese firmware with European SIM-map.

Algorithm for network recovery:

1. Restart your phone – sometimes the service “hangs” and requires a restart.
2. Manually add it. APN: Go to Settings. → SIM-maps and mobile networks → [Yours. SIM] → Access points (APN). Press Add Add Add. APN and enter your operator's settings (can be found on their website). Save and select a new one. APN.
3. Reset network settings: Go to Settings → The phone. → Resetting settings → Reset the network settings. Confirm the action and restart the phone.
4. Check the firmware region: If you have Chinese firmware, install global through Fastboot or MIUI Downloader.

If nothing helps, try a temporary solution:

• 📌 Set up the second. SIM-Card (if the phone supports Dual) SIM) — Sometimes it will wake up the network.
• 📌 Turn on Flight Mode for 30 seconds, then turn off.
• 📌 Check if the modem modem is enabled in the settings.

How to check if the activation service is fake SIM» on your Xiaomi?

Some users are concerned that SIM Activation Service is a virus or spyware. Indeed, scammers sometimes disguise malware as system services. Here's how to distinguish the original from the fake:

To verify the authenticity of the service:

1. Install the APK Analyzer from Google Play.
2. Scan the file. SIM Activation Service.
3. Check the certificate – it must be signed by Xiaomi Inc.

If you find a fake,

• 🛡️ Remove the application through Settings → Annexes.
• 🛡️ Scan your phone with an antivirus (Malwarebytes or Dr.Web).
• 🛡️ Reset your phone to factory settings.

💡

If you doubt the authenticity of the service, check its hash via VirusTotal. APK through APK Extractor and upload to the site for analysis.

Alternative activation methods SIM Xiaomi without standard service

If you deleted SIM Activation Service and faced problems, or the service simply does not work on your firmware, you can use alternative methods of network configuration:

1. Manual tuning APN

The most reliable way is to manually enter parameters, examples for popular operators:

• 📡 MTS: Name — MTS, APN — internet.mts.ru, type APN — default,supl.
• 📡 Beeline: Name is Beeline, APN — internet.beeline.ru, type APN — default,supl,mms.
• 📡 MegaFon: Name is Megafon, APN — Internet, Type APN — default.
• 📡 Tele2: Name — Tele2, APN — internet.tele2.ru, Type APN — default,supl.

2. Applications for automatic setting APN

If you do not want to enter data manually, install one of these applications:

• 🔧 APN Settings – settings database for 500+ operator.
• 🔧 4G LTE Switch – helps to turn on the desired frequencies.
• 🔧 Network Signal Guru (requires root) - Advanced network settings.

3. Change of the firmware region

If the problem is caused by Chinese firmware:

1. Download the global firmware for your model from en.miui.com.
2. Install it via Fastboot or MIUI Recovery.
3. After re-flashing, reset the settings.

4.Use of the engineering menu

For experienced users:

1. Enter the code ##4636##.
2. Go to the phone information.
3. Select Network Setup and manually specify your preferred network type (e.g, LTE/WCDMA/GSM).

💡

If after all the manipulations the network does not appear, the problem may be a hardware malfunction (for example, damaged). SIM-In this case, only repairs will help.

FAQ: Frequent questions about the “Activation Service” SIM» Xiaomi