Changing a mobile device is always stressful, associated with the risk of losing important data. Among all the information stored on a smartphone, the phone book occupies a special place, because losing the numbers of friends, colleagues and emergency services can be a real disaster. There are many ways to migrate data: cloud services, Bluetooth, special applications or cable. However, the simplest, most universal and Internet-free method remains the good old transfer via SIM card.
This method is ideal for those cases when you need to quickly transfer base numbers from an old device to a new one without unnecessary Wi-Fi settings or authorization in Google accounts. Despite the development of technology, Android retains full compatibility with this standard, allowing the SIM card to be used as a physical storage medium. In this article we will analyze in detail the entire process, its nuances and limitations.
It is important to understand that this method is not suitable for all types of data. It is intended solely for phone numbers and contact names. If you plan to transfer photos, music, or chat history, you'll need other tools. However, to create a backup copy of the main phone book, the SIM card remains a reliable and time-tested solution that works even in the absence of a network.
Technical limitations and features of the storage format
Before you begin, you must clearly understand the technical limitations of the data storage format on the SIM card chip. This standard was developed decades ago, when mobile communications were in their infancy and phones did not have internal memory to store an address book. That is why the capacity of the SIM card is strictly limited and is not intended for storing multimedia or long text fields.
The main limitation concerns the length of the contact name. In most cases, the SIM card allows you to save a name of no more than 14-20 characters (depending on the encoding). If the name is longer, the system will automatically trim it when saving. It is also worth considering that you can usually add only one phone number per entry, although modern USIM standards may support multiple fields, but compatibility with them is not guaranteed on all devices.
⚠️ Warning: When copying contacts to a SIM card, additional fields such as email address, second phone number, home address or contact photo may be lost. The SIM card stores only the name and main number.
Another important feature is the character encoding. Old SIM cards may incorrectly display Cyrillic characters or special characters, replacing them with question marks or empty squares. Modern cards USIM eliminate this problem, but when transferred to a very old phone, difficulties may arise with reading Russian names. Always check the result after completing the procedure.
Before starting a bulk transfer, copy 2-3 test pins to make sure that the names are displayed correctly and are not cut off.
Preparing the old device for data export
The transfer process begins with preparing the source device. You need to make sure that the SIM card is installed in the smartphone from which you plan to copy data. If the card is in the new phone, remove it and insert it into the old device. Make sure that the device is turned on and is in an area with good signal reception, although the copy operation itself does not require a network.
Next, you should open the standard “Contacts” or “Phone” application. The interface may differ depending on the manufacturer's shell (MIUI, OneUI, ColorOS, etc.), but the logic of actions remains the same. You need to find the contact management menu. Usually it is hidden under a button with three dots, three bars, or indicated as “More” in the upper or lower right corner of the screen.
In the menu that opens, you need to find the item “Import/export contacts” or “Manage contacts”. This is where the key setting lies. The system will prompt you to select the source from which you want to copy the data. In our case, the source is Phone memory or the Google account where your numbers are currently stored. Select this option to begin the export procedure.
☑️ Preparing for export
Step-by-step guide for copying to a SIM card
After selecting the data source, the system will prompt you to determine the destination - the location where the data will be saved numbers. Select "SIM card" from the list of available options. If you have two SIM cards in your device, carefully select the one that will be moved to the new phone. An error at this stage will result in contacts being saved to an unused card.
At the next stage, the system will show a list of all contacts available for transfer. You can select individual numbers manually or use the Select All feature. After confirming your selection, the copying process will begin. A warning may appear on the screen that some data (photos, addresses) will be lost - agree with it, as this is a normal situation.
The process takes from a few seconds to a couple of minutes, depending on the number of records. Do not turn off the phone or remove the SIM card at this time. Upon completion of the operation, the system will notify you that the copy was successful. Now the physical media contains all the necessary numbers and is ready for migration.
⚠️ Attention: Menu interfaces may vary. If you don't find the "SIM card" item, try entering a query in the search for contact settings or check if the SIM card is hidden in the network settings.
Importing contacts to a new Android smartphone
After successfully exporting the data, remove the SIM card from the old device and install it in the new smartphone. Turn on the device and wait until the operating system loads completely. Make sure that the phone sees the network and has correctly identified the card. Now you need to start the import process to move the numbers from the card to the internal memory of the new device.
Open the Contacts application on the new phone. Go back to the settings or contact management menu (three dots or menu button). Find the "Import/Export Contacts" section. This time we need to select the “Import” action. Specify “SIM card” as the source.
The system reads the data from the chip and prompts you to select a location to save it. It is recommended to select "Phone" or your Google account. Saving to a Google account is preferable, as this will ensure automatic synchronization and protection against loss if the device breaks down. Confirm the import and wait for the process to complete. After this, all numbers will appear in the phone book of the new smartphone.
Saving contacts to a Google account on the new phone will ensure that they are automatically restored during any future change of device without reusing the SIM card.
Comparison of transfer methods and risk analysis
Although the SIM card method is popular due to its simplicity, it is not without disadvantages compared to modern cloud technologies. Understanding these differences will help you choose the best method for your situation. Below is a table comparing transfer via SIM card with synchronization via Google Account.
| Parameter | SIM card | Google Account |
|---|---|---|
| Saving photos | No | Yes |
| Name length | Limited (~20 characters) | No restrictions |
| Internet required | No | Yes (for synchronization) |
| Number of numbers | One per contact | Many (mob, home, slave) |
The main risk of using a SIM card is the possible loss of name formatting and additional data. If you have “Ivan Petrovich (work)” written in your contact, on the SIM card this can turn into “Ivan Petrovich (". In addition, the SIM card has a physical limit of entries, which usually ranges from 250 to 500 contacts. If your phone book is larger, some of the numbers will simply not be copied.
However, for users who do not want to be tied to cloud services or do not have access to Wi-Fi, this method remains the only reliable option. It does not require the installation of third-party software, does not consume traffic, and works on any device that supports the GSM standard, regardless of the year of manufacture.
What to do if contacts are not displayed after import?
If after import you see an empty list, check the display settings in the Contacts application. Tap on the menu (three dots). → “Contacts to display” and make sure that your SIM card is selected or “All contacts” is checked. Sometimes the phone hides entries from the SIM card by default.
Solving common problems during transfer
During the process of transferring data, users often encounter technical difficulties - a message that the SIM card memory is full. happens if you try to record more contacts than the chip allows. In this case, you will have to either delete old unnecessary records directly from the SIM card, or transfer contacts in parts.
Another common situation is the appearance of contacts with the same names or duplicate numbers. This happens if you have already imported some of the data or if there are old records on the SIM card. To solve this problem, use the “Merge duplicates” function, which is available in most modern Android shells, or delete unnecessary entries manually.
If the phone writes “SIM card error” when trying to record, check whether the card is protected by a PIN code. In some cases, you may be required to enter your PIN before starting the copy operation. Also make sure that the contacts are actually saved in the phone's memory, and not just in the cache of the messenger application (for example, WhatsApp or Viber), since they cannot be copied through the standard contacts menu.
Is it possible to transfer contacts if the screen of the old phone is broken?
If the touchscreen does not work, but there is an image, try connecting a USB mouse via an OTG adapter. This will allow you to manage the menu and start copying. If there is no image, transferring via a SIM card without turning on the phone is impossible.
What to do if the contact names have become “crazy”?
This is an encoding problem. Try changing the interface language of your old phone to English before exporting, copying the contacts, and then returning the Russian language. Sometimes updating the phone's firmware helps.
How many maximum contacts can a SIM card hold?
The standard capacity is from 250 to 500 entries. The exact number depends on the operator and card type. If full, new entries will not be saved until you delete the old ones.
Will call history be saved when transferred via SIM?
No, the SIM card only stores the phone book (names and numbers). The call log (incoming, outgoing) is stored in the phone's memory and is not transferred by this method.
Do you need to remove the SIM card when transferring via Google?
No, when using cloud synchronization, physical movement of the SIM card is not required to transfer contacts. It is enough to log in to the same Google account on the new device.