How to copy numbers from your phone to Xiaomi SIM card

Xiaomi, Redmi and Poco smartphone owners often have to move their phone book when changing devices or to back up on physical storage. Despite the ubiquitous cloud storage, the SIM card remains a versatile and reliable way to transfer data between different operating systems, for example, when switching from Android to a button phone or devices of other brands.

The MIUI or HyperOS shell copying process is simple enough, but has its own nuances that can be confusing to the inexperienced user. In this article, we will analyze the algorithm of actions in detail, consider possible errors and answer frequent questions so that you can safely manage your contacts.

It is worth noting that the SIM memory is limited, so this method is best suited for saving names and primary numbers, rather than a complete correspondence history or additional fields.

Preparation for data transfer and compatibility check

Before you start the copying procedure, you need to make sure that your SIM card is technically ready to write information. Older Mini-SIM cards or worn-out chips may not support storing a large number of records or have no free space at all.

Modern Xiaomi smartphones work with nano-SIM, but the physical size does not guarantee enough internal memory chip to store hundreds of contacts with long names.

It is also important to understand the difference between storage formats: SIM card contacts are usually limited to one number per name and a short text field, whereas a phone or Google account can store photos, emails, addresses and multiple numbers.

⚠️ Note: When copying to a SIM card, long names may be cropped and additional numbers (work, home) will be lost, as the standard SIM Supports only one primary number on the record.

Make sure the card is properly installed in the slot and is determined by the system. If you use a dual-sim device, choose the card you plan to record to avoid confusion in the future.

Step-by-step: copying through the Contacts app

The main and most reliable way to transfer data is to use the regular Contacts app, which is pre-installed on all Xiaomi devices, which does not require the installation of third-party software and ensures the correct display of data.

To start, open the Contacts app on the home screen or in the Tools folder. At the bottom of the screen, find and click the menu button, which is often indicated by three horizontal lines or dots, or go to settings through the top corner.

In the menu that opens, select Import/Export contacts. The system will suggest selecting a data source. If your numbers are stored in your phone memory, select Device Memory or Phone. If they are synced with your account, select the corresponding Google account.

Next, select destination. In the list of available options, find and click on SIM card 1 or SIM card 2, depending on which slot is active, the system will warn you that some data may be lost due to format limitations, and request confirmation of the operation.

Once confirmed, the copying process will begin. The run time depends on the number of records. When completed, you will see a successful export notification. Your numbers are now available on any device where this card is installed.

Use of the SIM card management menu

Some versions of MIUI firmware offer an alternative way through system settings that allows you to manage the contents of the card in more detail, a method that is useful if the standard contact application is not working properly.

Go to Settings on the main menu of the smartphone. Find the SIM card and mobile network section (or just «SIM-Maps. This displays information about balance, traffic and memory usage.

Select the desired SIM card from the list. In the menu that opens, find the Contacts item on the SIM-You click on it, you get to the list of all the records stored on the chip.

• 📱 Here you can see the real number of occupied and free memory cells.
• 📥 Import function from the phone memory in a mass manner.
• 🗑️ You can delete old or unnecessary entries directly from the card.

Using this section allows you to visually control the memory filling, and if you see that the card is full, you will have to delete some of the old records before copying the new list or clear the card completely.

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Before mass copying, back up your contacts to Google Account. This will take a couple of seconds, but save the data in case of a crash when writing to SIM.

Storage format limitations and memory size

Users often wonder why photos, email addresses, or second numbers are missing after the transfer, due to the technical limitations of the GSM standard, which did not initially involve storing media or complex data structures.

The maximum number of contacts varies depending on the manufacturer of the chip and its age, but usually ranges from 250 to 500 records. If there are 1000 contacts in the phone, the system will prompt you to choose which ones to copy, or only copy the first N records.

The name is also limited in length, and the standard allows for around 15-20 characters, and the long name "Alexander Vladimirovich" can turn into "Alexander Vladim," making it difficult to search alphabetically.

That is why a SIM card should not be seen as the primary or sole storage location for an important phone book, but as a temporary data buffer, not an archive.

Solving problems and errors when copying

Despite the simplicity of the procedure, Xiaomi users can encounter errors, most often the system says “Memory is filled” or “copy error”, which can be caused not only by a lack of space, but also by a software failure in the reading of the chip.

If the process freezes or gives an error, try removing the SIM card, wipe the contacts with a soft dry cloth and insert back in. Make sure the card sits tight and the tray is closed before the click.

Another reason could be the format of the contacts file, and if you imported contacts from an iPhone (vCard) or other source, some characters in the names may not be compatible with the SIM card encoding, in which case you might try to copy the contacts in small groups of 50.

⚠️ Note: Do not remove the SIM card or turn off the phone while recording. Power interruption at the time of file modifications may damage the file system of the card.

If nothing works, use a computer. There are special SIM readers that allow you to view content through a PC and clear the memory, then try again from your phone.

Alternative methods: Bluetooth and vCard files

If direct copying is not possible due to overcrowded card memory, you can use the intermediate format vCard (.vcf) This method allows you to transfer contacts to another phone and from there write them to the SIM card of the new device.

Create a file with all contacts in the Contacts app via the Import/Export menu -> Export to file.vcf. Transfer this file via Bluetooth, Wi-Fi Direct or messenger to the device in which the target SIM card is installed.

On the receiving device, open the file. The system will suggest importing contacts. Select the option "Import to SIM card." This method is good because it allows you to pre-edit the list on the large screen of a computer or tablet.

It's also useful for archiving, and by storing a file on a flash drive or in the cloud, you create a complete copy of the phone book that can be restored even after many years, when the SIM card is lost or damaged.

FAQ: Frequently Asked Questions