Changing a SIM card is always stressful due to the risk of losing important information. Most often, users are concerned about the fate of the phone book, because the numbers of colleagues, friends and delivery services can be recorded directly on the chip of the old operator. In the world Android the process of copying data has become as automated as possible, but the physical limitations of old SIM cards still play a role.
Modern smartphones, by default, offer to save all entries to a Google account, which frees you from being tied to a specific medium. However, if you are used to storing numbers locally or you do not have a stable Internet connection, transferring to Samo SIM card remains the only reliable method of migration. This is especially true when switching to a push-button phone or using the device in dialer mode.
Before you begin manipulations, you need to make sure that the new SIM card is activated and inserted into the appropriate slot. A standard SIM card can hold up to 250 contacts, but older chips can limit this list to 50 entries. If your phone book is larger, some of the numbers will have to be transferred to several steps or choose cloud storage.
Device preparation and compatibility check
You should start the procedure by checking the technical condition of the device. Make sure that the smartphone correctly sees both SIM cards if you are using a dual-SIM device, or that the new card is correctly installed in the slot. In some models Xiaomi or Samsung when changing a card, you may need to enter a PIN code, which is better to know in advance so as not to block the chip after several unsuccessful attempts.
It is important to understand the difference between saving to the phone’s memory and to the operator’s chip. The device's memory allows you to store long names, add photos, email addresses and several numbers for one contact. SIM card has strict limitations: usually it is only a name (often cut to 10-12 characters) and one number. Therefore, before transferring, it makes sense to clear the list of duplicates.
⚠️ Attention: When copying contacts to a SIM card, special characters, emoji and long names will be deleted or replaced with spaces due to limitations of the GSM format.
For comfortable work, it is recommended to close all background applications that can slow down the task manager. This is especially true for heavy games or navigators that consume a lot of RAM. If the phone is old, rebooting before starting the procedure will be an excellent solution to free up system resources.
Importing contacts from the phone’s memory to a SIM card
The most common scenario is when the numbers are already saved in the smartphone’s memory, and they need to be rewritten to a new chip. In the standard "Contacts" application on a clean Android algorithm of actions is as follows. First, open the app and find the settings menu, which is often hidden under three dots or a Manage Contacts button.
Next you need to select the import/export option. Depending on the version of the operating system (Android 10, 11, 12+), the name of the item may vary, but the essence remains the same. You need to select the action “Import from phone” or “Copy contacts”, and then specify the target device - your new SIM card (often indicated as SIM 1 or SIM 2).
☑️ Checklist before copying
The system will ask for confirmation of the action, warning about the possible loss of name formatting. After clicking the “Copy” or “OK” button, the transfer process will begin. The waiting time depends on the number of entries: for 100 numbers it will take no more than 10-15 seconds. Upon completion, you will see a notification indicating the successful completion of the operation.
If you have a dual-SIM phone, carefully select the target SIM card in the menu so as not to copy contacts to a card that is intended only for the Internet.
Export contacts from the old SIM card to the phone
If your goal is to free up space on the old one SIM card or simply copy the data before disposing of it, the reverse process is used. In this case, we export data from a SIM card to the internal memory of the device or to a vCard file. This is a standard procedure that works on most devices, including Huawei, Honor and Oppo.
Go to contacts settings and select “Import”. Indicate your SIM card in the list of sources. The system counts all available records. You will then be asked to select a destination: Google account, phone memory or another SIM card. For maximum security, it is better to choose Google or phone memory, as this will save data.
| Parameter | Phone memory | SIM card | Google Account |
|---|---|---|---|
| Record limit | Thousands of contacts | Usually up to 250 | No limits |
| Name length | Up to 100+ characters | 10-12 characters | Up to 100+ characters |
| Additional. fields | Photo, Email, Address | Number only | All fields |
| Risk of loss | If the phone breaks down | If physical. damage | Minimal |
After copying is completed, it is strongly recommended to check the result. Open your contacts list and make sure the numbers are legible and the names aren't a jumble of numbers or weird symbols. If you plan to move the SIM card to another phone, this step is critical.
Using a SIM manager in different shells
Electronics manufacturers often change interfaces, which can confuse the user. In the shell One UI from Samsung, the path to managing contacts may differ from the stock one. A standalone Contacts app is often used here, where the menu is hidden in the sidebar. Path to the copy function: Android. A standalone Contacts app is often used here, where the menu is hidden in the sidebar. Path to copy function: Menu → Contact management → Import/Export contacts.
In devices Xiaomi (MIUI/HyperOS) the logic is similar, but the visual design is different. You need to open the Contacts app, tap the man icon with a gear or the three dots, then select Import and Export. Here you can also see a detailed report on the fullness of the SIM card memory.
⚠️ Attention: Interfaces are being updated. If you do not find the described items, use the search in the phone settings by entering the request “contacts” or “sim”.
Some Chinese firmware versions may have a stripped-down menu or differ in the translation of terms. In such cases, it is useful to use the search function inside the settings. Enter the word “copy” or “import”, and the system itself will prompt you for the required section.
What to do if there is no “Copy to SIM” item?
Some telecom operators or specific phone models (especially American versions without full support for GSM standards) may not have the hardware recording function on a SIM card. In this case, the only way out is to save contacts to a .vcf file and transfer them manually or via the cloud.
Working with vCard files for backup
An alternative to direct copying is to create a backup file format vCard (.vcf). This method is universal and suitable for any device, including iPhone and computers. The vCard file contains all the information about the contact in a structured form and weighs very little.
To create such a file, in the import/export menu, select the “Export to device memory” or “Export to storage” option. The phone will create a file that can be found in the Downloads folder. You can send this file to your messenger, email, or save it to a flash drive.
The path to the file often looks like this:
/internal_storage/Contacts/contacts.vcf
To restore data on a new device, just open this file. The Android system will automatically recognize the format and offer to import entries into the phone book or SIM card. This is the most reliable migration method when completely changing a smartphone.
vCard files are the “gold standard” of backup, allowing you to transfer contacts between any platforms (Android, iOS, Windows) without losing data.
Solution and troubleshooting
During the transfer process, users often encounter errors. The most common one is “SIM card memory is full.” This means that you are trying to record more numbers than the chip allows. There is only one solution: delete unnecessary contacts from the SIM card or transfer them in parts, if the application allows you to select a range.
Another problem is that the contacts are copied, but are displayed as “Contact 1”, “Contact 2” without names. This happens if the encoding of names on the SIM card does not match the encoding of the phone (for example, Cyrillic versus Latin). In this case, the names will have to be renamed manually after transferring them to the phone memory.
- 📱 Make sure that the SIM card is not physically damaged (scratches on the chip).
- 🔄 Reboot the phone if the copying process is frozen.
- 💾 Check whether the memory of the smartphone itself, where temporary storage goes, is not full.
If the phone says “SIM access error,” try removing the card, cleaning the contacts with a soft eraser and inserting it back. Sometimes the problem lies in oxidation of the contacts or a loose fit of the card in the tray.
Frequently asked questions (FAQ)
Is it possible to transfer contacts from Android to iPhone via a SIM card?
Yes, it is possible. First, copy contacts from Android memory to SIM card. Then insert the SIM card into the iPhone. Go to Settings → Contacts → Import SIM contacts. However, this method will cut off long names and delete photos.
Where is it better to save contacts: to a phone or a SIM card?
It is definitely better to save to a Google account or phone memory. The SIM card has a small capacity and does not support modern data formats (photos, several numbers). If you lose your SIM card, you will lose all your numbers.
What to do if the numbers disappear after the transfer?
Don’t panic. Check your display settings in the Contacts app. Often there is a filter “Phone only” or “SIM only”, and you need to select “All contacts”. Also check the trash can in the contacts application, if there is one.
How many contacts can a modern SIM card hold?
Standard modern SIM cards (USIM) usually hold about 250 entries. Older cards may have a limit of 50 or 100 numbers. The exact number depends on the operator and the year the card was issued.