Many users switching to modern smartphones from push-button predecessors are faced with an unexpected problem: their important messages remained on the old SIM card. Unlike old phones, where the SIM card was the main storage of contacts and texts, modern devices based on Android use internal memory or cloud services. This creates the illusion of data loss, although in fact the information is simply located in a different place.
The transfer process is not always automatic, since the operating system often ignores messages on the SIM card when first launched. You will need to perform a number of manual actions or use specialized codes to “pull” texts from the card chip into the smartphone’s memory. In this article we will analyze all the available methods, from built-in functions to third-party utilities.
It is worth noting right away that the memory capacity of the SIM card is extremely limited. Usually it holds no more than 30-50 short messages, so we are talking about saving really important correspondence, and not archives for several years. Let's take a look at how to extract this data as efficiently as possible.
Features of storing messages on SIM and in Android memory
The architecture of data storage in mobile networks has undergone significant changes over the past decades. Previously SIM card (Subscriber Identity Module) served as a universal medium where contacts and incoming messages were recorded SMS. This made it easy to change phones by simply moving the plastic card. However, modern security standards and the volume of data have made this approach ineffective.
In the operating system Android messages are by default saved in the device's internal storage or synchronized with an account Google. When you insert a SIM card with saved messages into a new smartphone, the system sees them, but does not display them in the general conversation feed, so as not to create duplicates and confuse the user.
⚠️ Attention: The format of messages on a SIM card is often limited to 160 characters. Long messages sent from modern smartphones could be broken into several parts or truncated when saved to the old chip.
Understanding this difference is critical. You're not "transferring" messages in the traditional sense of copying files, but rather importing them from one storage format to another, making them available to the standard Messages app.
Always back up important SMS to a cloud drive or computer before any manipulation of the phone's memory, even if it involves old data.
Using the built-in import functions in Android
Most smartphone manufacturers provide a standard mechanism for working with outdated data. The default messaging app often has an import feature hidden away. To find it, you need to open the application, click on the three dots in the corner of the screen (menu) and select Settings.
In the menu that opens, look for the section related to managing messages or additional functions. There may be an option Manage SIM card messages or Copy messages. The interface may differ depending on the manufacturer's shell (MIUI, OneUI, ColorOS).
After entering the control menu, you will see a list of messages located directly on the SIM card chip. The system will offer to select the required items or select all at once. Once selected, the copy or move button is activated.
- 📱 Open the Messages application and go to the settings menu.
- 💾 Find the item "Manage SIM card messages" or similar.
- ✅ Select the necessary messages to transfer.
- 📥 Click the "Copy" or "Move to device" button.
It is important to know that on some versions Android (especially starting from 11 and higher) Google has removed direct access to this menu from the standard application. In this case, you will have to use the alternative methods described below.
Transfer through the engineering menu and USSD codes
If the graphical interface does not provide import options, you can try using hidden phone functions. Some smartphone models respond to special codes called through a dialer. These are the so-called engineering codesthat give access to deep settings.
However, you should be careful: there is no universal code for all models. Combinations depend on the processor (MediaTek, Qualcomm) and manufacturer. An attempt to enter an incorrect code in the engineering menu may result in resetting the network settings.
⚠️ Attention: Using the engineering menu requires caution. Changing unknown parameters may disrupt the operation of the communication module. Act only if you are confident in your actions.
The most common method, but does not guarantee results, is the use of code ##4636##. It opens the testing menu, where in the section Information Sometimes you can find message data, although there may not be a direct copy function there. A more effective way for older phones was to use codes like ##7780##, but on modern ones Android they are often blocked.
What to do if the codes do not work?
If standard codes do not open the menu, then the manufacturer has blocked this access at the firmware level. In this case, the only solution is to use third-party software or manually reprint critical data.
Use of third-party recovery applications
When built-in tools are powerless, applications from the store come to the rescue. Google Play. There are many utilities designed specifically for migrating data from old phones and working with SIM cards. They are able to read the SIM card memory sector, which the standard system ignores.
One of the popular solutions is an application SMS Backup & Restore or specialized managers like Copy My Data. When installing such software, you must give it extended permissions to access messages and contacts. After scanning, the application will offer a list of messages found on the SIM card.
The process usually looks like this: you run a scan, the application reads the data, and then offers to export it to a format that the current system can understand. This can be an XML file or direct import into the database SMS.
| Application | Functional | Complexity | Advertising |
|---|---|---|---|
| SMS Backup & Restore | Full backup and import | Low | Available in free version |
| Copy My Data | Transfer between devices | Medium | Minimum |
| Super Backup | Cloning SMS and contacts | Low | Present |
| Smart Transfer | SIM reading and cloud | High | No |
Using third-party software is the most reliable way for modern versions Android, where access to the file system and equipment is strictly regulated. Make sure you only download apps from trusted sources.
☑️ Check before installing apps
Solving problems with encoding and display
A frequent problem during transfer is incorrect display of text. Instead of letters, the user sees a set of symbols or question marks. This is due to the difference in encodings: old phones used GSM 7-bit, and modern smartphones work with Unicode (UTF-8).
If after copying the text becomes unreadable, try changing the input language or encoding settings in the importer application. Some apps allow you to forcefully select the encoding when reading data from a SIM card. Also, the problem may lie in the length of the message.
If messages are broken into parts, the import application must be able to assemble them back into a single text. If this does not happen, you will have to read them separately. Critical: Do not delete messages from the SIM card until you are sure that they are displayed correctly and saved in the phone's memory.
Sometimes simply restarting the device after the copying procedure helps. The system re-indexes the message database, and "lost" or incorrectly displayed texts may fall back into place.
Encoding problems can be resolved by choosing the correct format when importing or updating the messaging application.
Alternative methods and manual copying
If software methods do not produce results, the most reliable, albeit labor-intensive, method remains - manual. To do this, you will need an old phone into which you can insert a SIM card, and a new smartphone. You can send messages from your old device to your number or to another phone, and then save them.
Another option is to use Bluetooth. If both phones support Bluetooth messaging, you can send the selected SMS directly. The receiving device (your new Android) will ask you to save the received message.
Do not forget that the SIM card has physical wear and tear. Frequent reading and writing may damage the contacts or memory of the chip. If the information is really important, it is better to copy it once and not touch the original on the SIM card again.
In conclusion, transferring messages from a SIM card to Android is a solvable task, but requires care. Modern security systems sometimes make direct access difficult, but using the right tools can overcome these restrictions.
Is it possible to recover messages deleted from a SIM card?
Recovering deleted messages from a SIM card is extremely difficult and almost impossible at home. The SIM card memory does not have a file system in the usual sense, and when deleted, data is marked as free space, which is quickly overwritten. Specialized equipment for this is expensive and is available only to special services.
How many messages can a SIM card hold?
The standard memory capacity for SMS on a SIM card varies from 20 to 50 messages. It depends on the card manufacturer and its age. New cards may have a slightly larger capacity, but the storage architecture remains limited compared to smartphone memory.
Will messages on the SIM be lost if you remove it from the phone?
No, messages are stored directly in the memory of the SIM card chip. If you remove the card and insert it into another phone (even a push-button), the messages will remain in place until you delete them or overwrite them with new ones.