If you have ever been given a notification «SIM Activate Service on their Xiaomi device, you've probably wondered what it is, why it comes up, whether it can be turned off. MIUI, It's the one that's responsible for the correct operation of mobile communications, unlike standard settings. SIM-map, «SIM Activate Service manages low-level processes for activating an operator profile, checking network compatibility, and can even affect Internet speed.
In this article, we will understand how the service works on different devices – from the flagship Xiaomi 14 Ultra to the budget Redmi Note 12, why it sometimes “hangs” in the status of “activation”, and what to do if errors like “I failed to activate” appear. SIM». We pay special attention to the differences between physical SIM If you plan to use your smartphone abroad or switch to a virtual operator (for example, Tinkoff Mobile or Yota), this information will be especially useful.
What is Xiaomi SIM Activate Service and Why You Need It?
SIM Activate Service is a system process in MIUI firmware that is responsible for:
- 🔄 Initialization SIM-cards at the first inclusion or after resetting settings.
- 📡 Compatibility check with operator networks (2G/3G/4G/5G, VoLTE, VoWiFi).
- 🔐 Activation of the operator profile (including configuration updates for eSIM).
- ⚡ Optimizing the power consumption of the communication module (for example, disabling network search in sleep mode).
In practice, this means that without the service working properly, your Xiaomi can:
- 🚫 Do not catch the network after rebooting.
- 📵 Showing "No Service" When Working SIM-map.
- 🐢 Networking. 2G instead 4G/5G.
- ❌ Don't send SMS or not to take calls.
It's important to understand that it's not an application, it's part of the firmware. You can't delete it, but you can control it through settings or an engineering menu. On some devices (like POCO F5), the service may be called SIM Manager or Mobile Network Service, but the essence remains the same.
How the service works on different Xiaomi devices
The algorithm of the work SIM Activate Service depends on the device model, version MIUI type SIM-Let's look at the key differences:
| Type of device | Features of the service | Typical problems |
|---|---|---|
| Smartphones with physical SIM (Redmi 10C, POCO X5) | Activation when you first turn on or change your card. Supports dual SIM with network priority. | Hanging on “Activation SIM”, conflict of two cards. |
| Devices with eSIM (Xiaomi 13T, Mix Fold 3) | It requires a download of the operator profile, and the service checks for compatibility with the eSIM protocol. | Error “Cannot upload profile” and lack of support from the operator |
| Tablets (Xiaomi Pad 6) | It only works with LTE-The service is optimized to save power. | Incorrect display of signal level, problems with VoLTE. |
| Smartwatches (Xiaomi Watch 2 Pro) | A simplified version of the service, activates only basic communication functions (calls, SMS). | Loss of communication after firmware update. |
For example, on Xiaomi 12S Ultra, the service automatically switches between physical SIM and eSIM depending on network priority, while on Redmi A2 it can require manual reboot when changing operator. In MIUI 14 and later, the Smart Activation feature is added, which analyzes the quality of communication and reconnects to the best cell.
💡
After the update MIUI mobile Internet is missing, try to manually select the operator network in the settings (Settings) → SIM-maps and mobile networks → Choice of network).
Why the service may not work: common mistakes
Problems with SIM Activate Service usually manifest the following symptoms:
- 🔄 Infinite “activation” SIM» status-bar.
- ❌ Message «SIM-The card is not supported with a good card.
- 📵 No network after reboot.
- 🚨 Error: “Cannot activate the mobile network».
The reasons can be divided into three categories:
- Problems with SIM-card-carrier: 🛡️ Card blocked PUK-code. 🔄 Operator does not support VoLTE/VoWiFi (relevant for MTS, Beeline in some regions). 📡 Wrong settings APN (especially after the change of operator).
- Firmware failures or conflicts: 🐞 Bug in MIUI (for example, in versions 13.0.4–13.0.6 There was a massive bug with Dual activation. SIM). 🔧 Conflict with custom settings of the engineering menu (##4636##). 📱 Damage to files /efs (section IMEI and modem settings).
Hardware malfunctions:
- 📶 Damage to the antenna module (often after falling).
- 🔌 Oxidation of slot contacts SIM.
- 🔋 Modem malfunction (for example, on Redmi Note 9 Pro after overheating).
How to check if your Xiaomi IMEI is blocked?
Step-by-step: how to fix SIM activation errors
If SIM Activate Service is not working properly, follow this algorithm:
☑️ Diagnostics and troubleshooting problems with SIM Activate Service
Step 1: Basic diagnostics
- 🔄 Reboot your smartphone – sometimes the service will “hang” due to a temporary failure.
- 📱 Check it out. SIM-If it doesn't work, the operator has a problem.
- 🔍 Check out the slot. SIM for damage or oxidation (relevant to the POCO M5s cockpit).
Step 2: Network settings
- Open the Settings. → SIM-maps and mobile networks.
- Choose yours. SIM-map and check: 🔘 Is the switch "Mobile data" switch on». 📡 Network mode (recommended «4G (preferably)»). 🔄 Automatic Network Selection option (if disabled, select operator manually).
"Access Points (APN)"
Step 3: Resetting network settings
If previous steps have not helped:
- Go to Settings → About the phone → Reset settings.
- Select Network Settings Reset (does not delete data, but resets Wi-Fi, Bluetooth, and mobile network).
- After rebooting, reset the APN.
⚠️ Note: When using eSIM on Xiaomi in roaming, some operators (for example, A1 in Austria) require the preliminary activation of the service "International roaming" through the personal account. SIM Activate Service will show an error "Can't connect to the network».
How to disable or limit the service (if it interferes)
In most cases, it is not recommended to turn off the SIM Activate Service, but there are ways to reduce its activity:
Method 1: Restriction of background activity
- Go to Settings → Applications → Application Management.
- Find the SIM Activate Service (or SIM Manager).
- Select “Limit background activity” and “Disable autostart”.
Method 2. via ADB (for advanced users)
If the service consumes too much charge, you can disable its autostart command:
adb shell pm disable-user --user 0 com.android.simactivator⚠️ Warning: This can cause problems with mobile communications after the reboot:
adb shell pm enable com.android.simactivatorMethod 3: Engineering menu (at your own risk)
For Qualcomm Snapdragon devices (e.g., POCO X6 Pro):
- Enter the code ##4636##.
- Go to "Phone Information."
- In the Network Settings section, select GSM Only or WCDMA Only (this will reduce service activity).
⚠️ Note: On devices with MediaTek (e.g. Redmi Note) 12) Changing the Engineering Menu settings can cause a loss IMEI. Before experimenting, make a backup copy of the section /nvram through TWRP.