Xiaomi SIM Activation: What It Is and How to Set Up a Network

Owners of smartphones Xiaomi, Redmi and Poco often face an incomprehensible status SIM-The screen may flash, show a crossed out communication icon or require incomprehensible actions in the menu. Many users mistakenly believe that some specific “activation” is required through a code or hidden menu, but in fact the process boils down to the correct initial registration of the device in the network of the cellular operator.

The concept of activation in the context of the MIUI or HyperOS ecosystem most often implies successful completion of identification procedures in the network and the correct configuration of APN access points. Without this step, the Internet will not work even if calls pass. In this article, we will discuss the technical nuances of how to make a smartphone see the network, why there is an error “Not registered in the network” and how to properly configure the priority of SIM cards for stable operation.

It is worth noting that modern Chinese-made devices, even global versions, can have the peculiarities of working with European and Asian frequencies. A critical point is to check the support of your operator's bands in a particular region, since software "activation" will not compensate for physical frequency incompatibility. If you just bought a phone, do not panic if there is no connection - in 90% of cases the problem is solved by simply reconfiguring network parameters.

What does the “Not Activated” status mean on the lock screen

When you first insert SIM-The card in the new Xiaomi smartphone, the system starts the handshake process with the base station. the status "Not activated" or "Required activation" often appears in notifications or on the lock screen. This does not mean that the SIM card is blocked by the operator. IMEI The device has not yet been fully authorized in the local network or data transmission parameters are not configured.

In some cases, especially on devices designed for the Chinese market (CN Version, the activation message may be Mi Account services or regional restrictions. However, if it is a cellular connection, the system reports that it is not possible to establish a stable connection. 2G/3G/4G, but never register.

Sometimes, the reason for this status is outdated carrier profiles, sewn into firmware. The Android operating system in the shell of MIUI uses a database to automatically configure the Internet. If your operator is new or rare in the region, automatic activation of parameters may not work, in which case manual intervention in the settings of the mobile network is required.

⚠️ Warning: If the activation message appears after resetting to factory settings, make sure the device is not on the blacklist. IMEI through special services of operators will help to eliminate locking at the equipment level.

It is important to distinguish between activation itself. SIM-The card from the operator (the procedure performed when buying) and activation in the phone. SIM-The security system may request confirmation via SMS or call to unlock some features related to sending messages to prevent spam sending malware.

Physical installation and choosing the right slot

The first step in solving network registration problems should always be to check the physical contact. SIM-cards in Xiaomi smartphones are of different types: combined (SIM + microSD) or hybrid (two) SIM). Incorrect installation of the chip is the most common cause of errors».

Modern models support Dual SIM Dual Standby technology, but not all slots are equal. In budget and medium-sized models (Redmi Note, Poco M), often only the first slot supports high 4G/LTE speeds and frequency aggregation, while the second one can be limited to the 2G/3G standard. If you insert the main SIM card with an Internet tariff into the second slot, the activation of the high-speed connection may not occur.

For proper installation, it is necessary:

• 📱 Remove the tray with a paper clip, making sure the phone is turned off (although many models support hot-swap, it is better to reboot for primary activation).
• 💿 Clear the contacts SIM-cards with soft dry cloth, removing oxides or dust.
• 🔍 Check the shape match: If you use an adapter or cropped SIM card, make sure it doesn't hang around in the tray.
• 📶 Insert the tray strictly in the correct orientation, focusing on the bevelled corner.

If the phone vibrates after installation but says "No network", try swapping the SIM cards in places, which will help diagnose the slot malfunction, and check whether the tray itself is mechanically damaged - deformed contacts inside the smartphone often cause signal loss.

Setting up mobile network and APN access points

After successful physical installation and registration on the network (the appearance of signal level icons), the critical step is to configure the access points APN (Access Point Name), these parameters are the phone, through which gateway to access the Internet. Without the correct APN, you can not “activate” the Internet, even if the network is well caught.

Xiaomi will automatically adjust the settings when you first register. SIM-However, if this does not happen, you need to create a profile manually. → SIM-maps and mobile networks → Choose. SIM → Access points (APN). You need to create a new point by entering the data provided by your operator.

Pay attention to the field "Type APN". In modern 4G and 5G networks, it is recommended to prescribe the default,supl, dun value to ensure the operation of not only the browser, but also the service data, as well as the ability to distribute the Internet. After entering all the parameters, be sure to click "Save" and select the created point with a tick.

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If automatic settings do not come, send an empty SMS to the short operator number or download the official settings profile from your carrier’s website.

Solving the error “Not registered on the network”

One of the most annoying issues is the "Not Registered" status: The phone sees the SIM card, reads the IMSI, but the operator rejects registration, which can be caused by a software glitch in the Xiaomi modem or a conflict of network standards.

The first thing you need to do is force the radio to restart. 10-15 If that doesn't work, try manually selecting the operator. Go to Settings. → SIM-maps and mobile networks → Network selection. Turn off automatic selection and wait for the list of available carriers.

Often the problem lies in network type settings. In the preferred network type menu, select LTE or 4G. If your region has weak 4G coverage and your phone is struggling to catch on to it, the connection will be unstable, in which case switching to 3G can preferably temporarily solve the registration problem.

It’s also worth checking if you have a left-handed firmware build or a modified bootloader. On custom firmware (LineageOS, Pixel Experience), modem drivers may not work properly, especially on new Xiaomi models. Returning to stock Global ROM often solves the registration problem.

⚠️ Note: Do not try to "sweep" the modem or IMEI This action is illegal in many countries and can permanently disable the device (brick).

SIM mode choice and 4G/5G priority

In Xiaomi’s dual-SIM smartphones, it’s important to set up the mode correctly, allowing you to choose which card will be used for default data transfer and which one for calls only, and erroneous prioritization can create the illusion of activation problems.

If you use one SIM card for the Internet (for example, a tariff with a large amount of traffic), and the second only for calls, make sure that the Internet card is selected in the Data Transfer settings. SIM-You can customize scripts: for example, “Always ask” when sending the cards. SMS or call to avoid spending money from the main card.

For users living in 5G coverage, the activation of this standard is a pressing issue. In some global Xiaomi firmware, the 5G switch is hidden. It can be activated through an engineering menu or special commands, but it is worth remembering that turning on 5G significantly increases battery consumption.

To optimize the work, it is recommended:

• 🚀 Install a card with the Internet in slot 1, if you have a budget model of the phone.
• 📞 Set up the second card to Call Only if it is rarely needed to save charge.
• 🔄 Reset network settings periodically if there are constant switching between 3G and 4G.

Frequent Questions and Answers (FAQ)

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Successful activation of SIM on Xiaomi depends on three factors: the serviceability of physical contact, the correct settings of APN and the support of your operator frequencies of the chosen phone model.