Changing a mobile operator or losing an old one SIM cards often causes panic among smartphone users, because hundreds of important phone numbers can be stored on the device. Fortunately, the ecosystem Android provides many built-in data migration tools that allow you to save your entire address book without losing quality. The process of transferring contacts from one SIM card to another or directly to the smartphone’s memory has become much easier with the release of new versions of the operating system.
In this article we will analyze in detail all the possible ways to save your phone book. You'll learn how to safely extract data from the old chip, transfer it to new media, or store it in the cloud for eternal availability. Modern methods allow you to avoid manually interrupting numbers, saving you time and nerves when changing a tariff plan or device.
Preparing for the data transfer procedure
Before taking active steps, you need to make sure that your device is ready to work with new communication media. Check whether your smartphone SIM card format supports the new operator (nano-SIM, micro-SIM or eSIM). If the physical size of the chip does not match the slot, contact a phone store for a free replacement or use a special adapter, although the latter option is less reliable.
Make sure that the device's battery charge is at least 30-40%. The process of reading and writing data, especially if there are a lot of contacts, can consume energy, and suddenly turning off the phone while writing can lead to damage to the address book file. It is also recommended to check the availability of free space in internal memory the phone, since contacts will be temporarily or permanently stored there.
⚠️ Attention: If you are using a dual-SIM device, make sure that you correctly identify the SIM 1 and SIM 2 slots in the settings so as not to copy data to the wrong one media.
Make a backup copy of your current contacts if they are already in the phone memory. This is insurance in case the import process fails. In modern shells, such as One UI from Samsung or MIUI from Xiaomi, this function is often available in the contact management menu with one click.
☑️ Ready for transfer
Importing contacts from the SIM card into the phone memory
The most common scenario is transferring numbers from a physical SIM card to the internal storage of a smartphone or Google account. This action frees up space on the operator's chip and allows you to link numbers to your profile, ensuring their synchronization. To begin, open the standard application "Contacts"that is preinstalled on your device.
In the application interface, find the settings menu, usually indicated by three dots in the corner of the screen or a gear icon. In the list that appears, select Manage contacts or Import/Export contacts. The system will prompt you to select a data source; in this case, you need to specify SIM card or SIM card storage.
After selecting the source, the phone will prompt you to specify the destination. Here it is critical to choose the right option: "Phone", "Google Account" or the internal memory of the device. Choosing a Google account is the most preferable, as this guarantees the safety of data even if the gadget itself is lost or broken.
- 📱 Open the "Contacts" application on the main screen.
- ⚙️ Go to settings through the menu (three dots or gear).
- 💾 Select the "Import from SIM card" option.
- ☁️ Specify the target storage (Google Account or Phone).
The system will show a list of all numbers, found on the chip. You can select all contacts at once or mark only the ones you need. After confirming the selection, the copying process will begin, which will take from a few seconds to a minute depending on the amount of data.
When importing a large number of contacts (more than 500), it is better to split the process into several stages of 100-200 records to avoid freezing of the application interface.
Transferring numbers between two SIM cards
Sometimes there is a need to transfer the database of numbers directly from one SIM card to another, bypassing long synchronization with the cloud. This is relevant if you change your telecom operator, but want to save the numbers on the new physical medium. To implement this task, you will need a smartphone with support for two active SIM cards or the ability to quickly replace media.
If you have a dual-SIM device, insert both cards into the slots. Go to the contact management menu and select function Copy contacts. Specify the old SIM card (for example, SIM 1) as the source, and the new one (SIM 2) as the destination. The system algorithm automatically reads data from one chip and writes it to another.
If there is only one slot in the phone, the procedure becomes more complicated and requires an intermediate step. First, import numbers from your old SIM card into your phone memory as described in the previous section. Then remove the old chip, insert the new one and perform the export procedure from the phone memory back to the SIM card.
| Transfer method | Required equipment | Speed | Reliability |
|---|---|---|---|
| Direct exchange (Dual SIM) | Phone with 2 slots | High | Medium |
| Via phone memory | Any smartphone | Average | High |
| Via Google Account | Internet access | Depends on the network | Maximum |
| Via VCF file | File Manager | High | High |
Please note that SIM cards have limited capacity. Older chips can store no more than 250 contacts, with name length often limited to 10-15 characters. When transferring long names, they may be cut off, so saving the full version in the smartphone's memory is mandatory.
Using Google cloud synchronization
The most modern and reliable way to manage your phone book is to use the ecosystem Google. This method does not simply transfer numbers, but creates a live copy of them in the cloud, accessible from any device after logging into your account. To configure, open the system Settings of your Android.
Find the section Accounts or Users and accounts. Select your Google profile from the list. Make sure that the switch opposite the item "Contacts" is active. If synchronization was disabled, turn it on and click the “Synchronize Now” button.
All contacts imported into the phone's memory will be automatically uploaded to the company's servers. You can check the result by accessing the site contacts.google.com from your computer. There you can edit, delete duplicates and merge entries, which is much more convenient to do on a larger screen.
⚠️ Attention: Deleting a contact in the Google cloud interface will synchronously delete it from your phone if two-way synchronization is enabled. Proceed carefully when cleaning the database.
When you change your phone or SIM card, you just need to log into your Google account on the new device, and the entire phone book will be restored automatically in a couple of minutes. This eliminates the need to manually transfer data every time you change hardware.
What to do if contacts do not sync?
Try clearing the cache of the Google Play Services and Contacts application in the application settings. Also check if your Google Drive storage is full, as this may block data updates.
Export and import via VCF file
The universal format for transferring contact data is a file with the extension .vcf (vCard). This method is ideal if you need to transfer contacts to another device without using the Internet or cloud services, or create a local backup.
In the Contacts application, select the option Export contacts. The system will offer to save the file to internal memory or SD card. Usually the file receives a name contacts.vcf or contains the creation date. This file contains all the information about numbers, names and even photographs of subscribers.
To transfer to a new SIM card or another phone, copy this file in any convenient way: via Bluetooth, instant messenger, USB cable or email. On the receiving device, open the file, and the system will prompt you to import the entries it contains into the desired storage.
- 📂 Create an export file in the contacts menu.
- 📤 Send the file to the target device.
- 📥 Open the file on the new phone.
- ✅ Confirm the import into the desired folder.
This method is especially useful when switching to phones of other brands or operating systems, since the VCF format is an international standard and can be read by almost any device, including iPhone and push-button phones.
VCF file is the most reliable way to create a complete backup copy of contacts, which can be stored for years and restored on any device.
Solving common problems during transfer
Users often encounter a situation where, after transferring, numbers are displayed incorrectly or some of them disappear. The main reason lies in encoding differences or limitations of the old SIM card. If names are truncated or replaced with symbols, try changing the encoding when exporting, if this option is available on your phone model.
Another common problem is duplicate entries. When importing multiple times, the same numbers may be saved several times. Modern versions of Android have a built-in function Merge duplicates in the contacts settings. Use it to automatically clean the list.
If the phone does not see the SIM card when trying to import, check the cleanliness of the chip contacts. Wipe the metal surface with a soft cloth. Also make sure that the SIM card is not locked with a PIN that you have forgotten; in this case, you will need a PUK code, which can be obtained from your operator.
⚠️ Attention: Never try to remove the SIM card while data is being recorded (when the import/export progress bar is visible on the screen). This may cause permanent damage to the contact system file.
In rare cases, the problem may be software. Restarting your device in Safe Mode will help determine if a third-party application is blocking access to your phone book. If the transfer works in safe mode, remove the recently installed contact managers.
Frequently asked questions (FAQ)
How many contacts can a SIM card store maximum?
The standard capacity of a modern SIM card is from 250 to 500 entries. However, older cards can only hold 100-150 numbers. In addition, the length of the contact name is often limited on the SIM card (up to 14-20 characters), so full names may not be saved.
Is it possible to transfer contacts if the phone does not turn on?
No, to transfer data you need a working device that can read information from the chip. If the phone is broken, but the SIM card is intact, you can insert it into any other working phone and export numbers from there.
Will photos of contacts be saved when transferred to a SIM card?
No, SIM cards do not support storing graphic images. When exporting to a SIM card, photos will be deleted. To save photos, use export to your phone memory or Google Account.
How to transfer contacts from Android to iPhone?
The easiest way is to save contacts in Google Account on Android, and then on iPhone go to Settings -> Contacts -> Accounts, add the same Google account and enable contact synchronization.
What should I do if, after transferring, the numbers are displayed in +7 format instead of 8?
This is a feature of the recording format. You can fix this en masse by editing the contact on your computer (via Google Contacts) or use applications for normalizing numbers available in the Play Market.