Changing mobile devices or having to back up numbers often puts the smartphone owner in the position of data portability. In Xiaomi’s ecosystem, which runs MIUI shells or the new HyperOS, the data migration process has its own characteristics that differ from stock Android. Moving contacts directly to the SIM card is one of the most reliable ways to save the phone book, since data remains available even when a smartphone is completely broken or an account is lost.
However, users often face the limitations of the interface, which does not always offer an obvious path to perform this operation. Standard menus may be required to restrict the necessary functions or require additional actions to display the desired options. Understanding the logic of the contact management system will allow you to quickly and losslessly save important numbers in a universal format.
In this article, we will take a look at all the portability options available, with a focus on the specifics of Redmi and Poco, how to get around character limits, how to avoid duplication of records, and what to do if the standard import function is not activated, and this guide will be a comprehensive source of information for the safe management of your phone book.
Technical limitations and features of the SIM format
Before you start directly transferring data, you need to be aware of the technological limitations of the media: a SIM card is an outdated memory chip that was not originally designed to store large amounts of structured information, its main function was to identify the subscriber on the network, and storing contacts became an additional, secondary option with strict limits.
The main problem is the length of the record. While the internal memory of a smartphone or Google's cloud service allows you to save numbers of any length and add many additional fields to them, the SIM card has a strict limit. It is usually 20-25 characters for the name and a standard number format. Anything that goes beyond this will be cropped or distorted when copying.
⚠️ Note: When you copy long contact names, they can be cropped to the first 15-20 characters, and often lose additional numbers, email addresses and avatars.
Also, the storage format on the chip doesn’t support Unicode fully, which can cause problems with displaying Cyrillic characters on some older devices from other manufacturers. If you plan to transfer contacts to another brand’s phone, make sure the encoding is supported correctly. Otherwise, instead of names, you can get a set of incomprehensible characters.
It is also important to consider that a limited number of contacts can be recorded on a single SIM card, which varies depending on the card manufacturer and age, but usually ranges from 250 to 500 entries. If your phone book is larger, the system will suggest selecting only a portion of the contacts or the process will end in error after filling in the available memory.
Preparation of the device and verification of the SIM card
Successful operation depends on the correct preparation of the device. First of all, you need to make sure that the SIM card is physically installed in the slot and is determined by the system. On modern Xiaomi smartphones with a hybrid slot, it is important not to confuse the memory card tray and the SIM, although the system usually blocks work with contacts unless the card is recognized as a phone card.
Check the status of the card in the settings. To do this, go to Settings → About Phone → All settings → SIM card status. This should indicate the status of the "In the network" or a similar activity indicator. If the card is displayed as "Not" or "Unknown", the transfer of contacts is not possible until the connection problem is fixed.
☑️ Checking readiness for transfer
You should pay special attention to synchronization before any manipulations, even if you plan to store numbers on the SIM, the source data should be safe, it is recommended to make a backup through a Google account or Mi Cloud, which will allow you to restore the information to its original form if the copying process goes wrong and the data is damaged.
It is also worth checking whether the SIM card is blocked through the PIN-If when you turn on your phone or log in to the contact menu, the system requests PIN, If you don't unlock the chip, you don't have permission to write new data to the chip's memory, remember it or write it down so you don't lock the card permanently after three failed attempts to enter it.
Standard method of transfer through the Contacts application
The basic and easiest way to move numbers is built directly into the standard Contacts app, which is the standard for MIUI and HyperOS. The interface may vary slightly depending on the shell version, but the logic of actions remains the same for all Xiaomi, Redmi and Poco models.
To start, open the Contacts app (an icon with a human silhouette). In the upper right corner of the screen, find the menu button represented by three dots or three horizontal bars. Click on it to reveal the list of available actions. In the list that appears, you must select Import / Export contacts (in some versions, simply “Import / Export”).
The system will offer several options. We are interested in the option Export to the SIM-Note that if you have two SIM cards on your phone, the system will ask you to choose which one to write data to. Select the slot you want (SIM 1 or SIM 2.
- 📱 Open the Contacts app on the main screen.
- ⚙️ Click on the menu (three dots) and select Import/Export contacts.
- 💾 Select the option Export to SIM-map and confirm the action.
- ✅ Wait for the process to end and check the result.
It is important to note that the system can warn you that some contacts cannot be copied due to format limitations (for example, having multiple numbers in one contact or having a too long name).In this case, Xiaomi will offer to copy only basic information or skip problematic entries.
What to do if the SIM Export button is inactive?
Alternative method through system settings
In some firmware versions or with certain launchers, direct access through the contact app can be difficult or altered, and in these cases, the Android system’s deep settings that manage the data custodians come to the rescue, a technique that is considered more “technical,” but it often helps when the standard interface is buggy.
You need to go to general smartphone settings. Search by settings (the magnifying icon at the top) type the word "Contacts." The system will give you a list of related sections. Select Import and Export contacts. This opens an extended menu that duplicates the app's functions, but often works more stably in the background.
In the menu that opens, you will see a clear separation of sources and destinations. Select Export, then specify the source of Phone (or Google Account if contacts are stored there) and the recipient "SIM-The system will automatically filter out the contacts that can be transferred and prompt you to confirm the operation.
| Parameter | Through the Contacts app | Through System Settings |
|---|---|---|
| Availability | Always available. | Depends on the MIUI version. |
| Speed of operation | Tall. | Medium (long search) |
| Interface. | Simplified | Expanded |
| Selection of SIM slot | Automatic request | Manual selection on the menu |
The use of system settings is especially useful when you need to perform a mass transfer without the visual interface of the application, for example, if the screen of the smartphone is partially not working. This method also allows you to see the technical state of the SIM card storage, including the number of free memory cells.
Working with two SIM cards and choosing a slot
Xiaomi smartphone owners often use two numbers at the same time, which raises the question: which card to copy contacts to? The logic of the system is that when choosing to export to the SIM, the phone always specifies the target medium if the device has two active cards.
It is recommended to choose the SIM card that is installed in slot 1 for storing contacts. This is due to the historical prioritization of the first slot in the communication protocols and the lower risk of software conflicts when reading data when you load the phone.
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When transferring on dual-symbol devices, it is better to choose SIM-1, since it takes priority when downloading and is less likely to be affected by software failures when reading a phone book.
If you decide to split contacts between two cards, keep in mind that standard Android tools cannot divide a single contact database into two parts: you will have to manually select contacts for each card or use third-party management applications that allow you to flexibly filter the database before exporting, a time-consuming process that can lead to data loss.
So it’s best to keep your critical numbers on a map that’s always on your phone, or better yet, a cloud account that syncs with both lines.
Problem Solving: Duplicates and Recording Errors
The transfer process is not always smooth. The most common problem is the appearance of duplicates. Since the system does not always intelligently compare records when exported to the SIM, it can create a new entry "Ivan" even though the phone already has "Ivan" in its memory, but with an added office number, as a result, the SIM card will have two identical contacts with different numbers.
To combat duplicates, MIUI has a built-in cleaning function. Go to Contacts → Settings (three dots) → Tools → Clear duplicates. The system will suggest combining similar records or removing duplicates. Do this before exporting to the SIM so that the memory of the card is not littered with garbage.
⚠️ Attention: Combining contacts after export to the SIM can lead to data loss if the system decides to leave a record from the SIM card, which has a cropped format.
Another common mistake is to say, "SIM card memory is full," which happens even if you don't pick all the contacts, but only part of them, because each record takes up a different number of memory cells depending on the length of the name and number, and if there are many old entries with long names on the map, there may not be enough room for new ones physically.
In this case, you need to manually delete unnecessary entries from the SIM card. To do this, select the option of SIM Contact Management from the Import/Export menu. Here you can see a list of all entries taking up the space. Delete old, unnecessary numbers to make room for current contacts.