Owners of smartphones Xiaomi, Redmi and Poco often face the need to change the device or switch to another. SIM-Unlike older pushphones, modern Android smartphones store data by default in cloud services or internal memory, but the ability to write to a SIM chip has not gone away. This is especially true when switching to a button or using a device without a Google account.
The migration of data in the MIUI or HyperOS shell has its own nuances that can confuse the inexperienced user. Security and interface logic sometimes hide the desired menu items, making them not obvious. However, after several consecutive actions, you can easily copy all the necessary records to a physical medium.
It is important to understand that the SIM card has a limited amount of memory and supports only basic fields, such as name and number. Additional data, including avatars, email addresses, birthdays and addresses, will be irretrievably lost when transferred to the SIM, so it is recommended to back up important information in your Google account or on the Xiaomi cloud server before starting the procedure.
Preparation for data transfer and compatibility check
Before you start manipulating the phone book, you need to make sure that the SIM card is installed correctly and is determined by the system. In two-symbol Xiaomi smartphones, there is often confusion about which slot will be recorded, so visually check the location of the chip in the tray. If you use a virtual eSIM, then this procedure is technically impossible for it, since this type of card is not designed to store user contacts.
Also worth paying attention to is the format of name storage: Old SIM cards may not display Cyrillic characters correctly or shorten long names to the point of being a smog. 10-12 sign. UTF-Encoding on modern chips solves this problem, but when transferred to very old cards, names can turn into a set of incomprehensible characters.
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Take a screenshot of the current phone book or export it to the.vcf file before transferring it – this will create a rollback point in case of a copy failure.
Make sure your smartphone doesn’t have flight mode on and has a battery charge, although the copying process consumes minimal energy.If the phone book has thousands of records, the process can take several minutes, and interruption of the operation is undesirable.
Use of the built-in Contacts in MIUI application
The main tool for managing records is in the standard application, which is preinstalled on all devices of the brand. To get into the import and export menu, you need to open the Contacts app and go to the settings tab, which is usually hidden under the three-dot button or a gear at the top of the screen. In new versions of HyperOS, the interface may differ slightly, but the logic remains the same.
In the settings menu, you should find Import/Export contacts. This is where the data transfer functionality between different storage sources lies. The system will tell you to choose the direction of the operation: copy from device to SIM card or vice versa. SIM-map.
☑️ Algorithm of action
Once you have selected a source (internal memory or Google account), the system will ask you to mark specific records. You can select individual numbers or use the Select all at the top of the screen. Be careful: if you choose too many contacts at once, the process can take a long time, and the phone interface can temporarily become unresponsive.
⚠️ Note: When copying to a SIM card, long names will be cropped to the chip limit (usually). 10-14 characters, and additional fields (address, email) will be deleted.
Once the selection is confirmed, the copying process will begin, the progress of which will be displayed as a progress bar, and after the operation is completed, the system will give a notification of successful data retention, and you can find your numbers directly on the SIM card chip.
Alternative way through the phone settings menu
If the standard contact app is not working properly or available for some reason, you can use the system menu of the settings of the smartphone itself. This method is deeper and allows you to manage data storage at the level of the Android operating system. To do this, go to Settings -> Applications -> All applications and find in the Contact list.
Inside the app menu, you need to find a section related to data storage or synchronization. In some versions of MIUI firmware, the direct path to export is duplicated in System Applications -> Contacts -> Import / Export. This allows you to bypass possible home screen interface bugs.
This is especially useful if you have a third-party shell or launcher that hides the standard menus, and system settings take precedence and allow you to perform an operation even in safe mode of the device.
Why can't exports work?
Working with Google Contacts and Synchronization
The most reliable way to manage your number database is to use Google Contacts, a cloud service that not only saves data from loss when your phone breaks, but also provides a convenient web interface for editing. If your numbers are saved in a Google account, you can go to contacts.google.com from your computer, filter the necessary records and manage them centrally.
To transfer to the SIM card through this service, you first need to sync the data with the phone. Open Settings -> Accounts and sync, select your Google account and make sure that the slider opposite the Contact point is activated. Once synchronized, the numbers will appear in the device memory, from where they can be copied to the SIM in the standard method.
The advantage of using the cloud is that it can easily recover deleted records, and the web version of Google Contacts has a cart that stores deleted data for 30 days, which is a great insurance against any manipulation of data transfer to physical media.
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Using a Google account as an intermediate buffer is the safest method to keep the full data structure before pruning when writing to SIM.
Table of limitations and opportunities in transfer
When planning data migration, it is important to be aware of the technical limitations of the SIM storage format compared to the digital memory of a smartphone. Below is a comparison table showing the differences in supported fields.
| Parameter | Internal Memory / Google | SIM-map |
|---|---|---|
| Maximum length of name | Up to 100+ characters | 10-14 characters |
| Cyrillic support | Complete. | Depends on the chip (often cut off) |
| Number of numbers per name | Unlimitedly. | Usually 1 (sometimes 2-3) |
| Additional fields | Address, email, website, notes | Absent. |
| Photo of contact | Supported | Not supported |
And you can see from the table that the SIM card is an archaic medium that's not designed for today's multimedia contacts, and its primary purpose is to identify the subscriber on the network, and the storage of the phone book is a secondary and limited function.
If it is critical for you to save photos and full names, consider alternative backup options, such as exporting to a.vcf file or using the manufacturer's cloud services.SIM card recording should only be considered a temporary solution or a necessity for very old devices.
Solving Copying Problems and Errors
Users often experience a situation where the export button is inactive or the process ends in error. One common reason is overcrowded SIM card memory. Old-style chips can hold no more than 250 records, and if the limit is reached, the system will not allow new contacts to be added without deleting old ones.
Another problem may be filename format or group export encoding. If you try to copy contacts that contain special characters or emojis in a name, the system can automatically filter them or issue an error, in which case it is recommended to pre-edit the names by removing non-standard characters.
What to do if your contacts are missing?
It is also worth checking whether the SIM card is not protected from writing (PIN2 code), although in modern conditions this is extremely rare. If the problem is of a software nature, try restarting the Xiaomi smartphone and repeat the procedure.
⚠️ Attention: Don't pull out SIM-This can damage the file system of the chip and lose all the data written on it.