Changing a mobile device or the need to restore communication after a system failure often confronts the user with the need to migrate data. In the operating system Android 7.0 Nougat the process of exporting a phone book to physical media is implemented quite flexibly, but it has its own technical limitations, which you should know about in advance. Moving records to SIM card remains one of the most reliable backup methods, regardless of cloud services or the state of the smartphone's internal memory.
Many gadget owners mistakenly believe that the procedure is identical on all firmware versions, but the interface Contact in The seventh version of Android has undergone changes compared to earlier releases. It is important to understand the difference between copying and moving: in the first case, the data is duplicated, taking up space in two storages; in the second, the original is deleted from the internal memory after being written to the card chip. Choosing the right algorithm of actions depends on your final goal and the size of your phone book.
Before you begin manipulating data, it is strongly recommended to make sure that the SIM card itself is in good working order and that there are no blocks from the telecom operator. A damaged chip or an outdated card format can lead to the loss of some information during the recording process. Below we will analyze in detail standard export methods, alternative paths through third-party utilities and answer common questions that arise when working with contacts in the environment Android 7.
Preparing the device and checking compatibility
Before starting the export procedure, you need to make sure that your SIM card can accommodate the planned number of records. Older format chips often have a memory limit of 250 or 500 numbers, while modern ones can support up to 1000 entries, although in practice operators often limit this number. Exceeding the limit will result in the system simply not allowing you to complete the operation or cutting off some of the data without warning. Mini-SIM or Micro-SIM often have a memory limit of 250 or 500 numbers, whereas modern Nano-SIM can support up to 1000 entries, although in practice operators often limit this number. Exceeding the limit will result in the system simply not allowing you to complete the operation or cutting off some of the data without warning.
It’s also worth checking exactly how your current contacts are saved. In Android 7, they can be located in three different locations: in the phone’s internal memory, in your account Google or directly on the SIM card. To transfer, we need exactly those records that are stored in the device. If you see a person icon with the Google logo next to the name, then the contact is synced to the cloud, and direct export to a SIM card may require prior downloading or changing the display priority.
⚠️ Attention: Some telecom operators block the ability to write new contacts to their SIM cards through the smartphone menu, leaving the function read-only. In this case, the system will display an error when trying to save, even if the space on the card is free.
Make sure that your device's battery charge is at least 30-40%. Although the copying process is not energy-intensive, suddenly turning off the smartphone while writing data to the chip can damage the file structure of the memory card, making it unreadable for other devices. This is especially critical for older cards, the chips of which are sensitive to power surges.
☑️ Ready for transfer
Standard method of exporting through the Contacts application
The easiest and safest way to move data is built directly into the standard phone book application. The Android 7.0 interface may differ slightly depending on the manufacturer's shell (for example, MIUI, TouchWiz or clean Stock Android), but the logic of actions remains the same. Open the application Contact and find the settings menu, which is usually hidden behind three dots in the upper or lower right corner of the screen.
In the menu that opens, you must select the item Manage contacts or Import/export contacts. The system will offer several options: copying from phone to SIM, from SIM to phone, or between accounts. We are interested in the option Copy from phone or Export to SIM card. After selecting this item, the system will ask you to mark the records that you want to transfer.
- 📱 Use function "Select all", if you plan to transfer the entire phone book, this will save time.
- 🔍 Manually tick only important numbers if the SIM card memory is limited.
- 💾 Confirm the action by pressing the button Copy or
OKat the bottom of the screen.
The process can take from a few seconds to a couple of minutes depending on the number of records and the speed of the memory controller. Upon completion of the operation, the system will notify you that the copy was successful. It is important to note that when transferred to a SIM card, long names may be truncated to 10-15 characters, and additional fields such as an email address or photo will be lost, since the data storage format on the chip is extremely primitive.
Before mass copying, check one test pin. If the name was cut off correctly and the number was saved in full, you can proceed with the remaining entries.
Transfer through system settings and control menu
If the standard contacts application for some reason does not display the necessary menu items or does not work correctly, you can use the system settings of Android itself. This method is often more reliable on devices with custom firmware, where manufacturers change the standard interface. Go to the main menu Settings of your smartphone and scroll down the list to the section System or User and accounts.
In some versions Android 7 contact management is placed in a separate subsection within the storage settings. Find the item Contact and select the option Move contacts. Here the system will allow you to select the source (internal memory) and the destination storage device (SIM card 1 or SIM card 2 if you have a dual-SIM device). This approach, bypassing the intermediary application, sometimes helps to avoid software failures.
⚠️ Attention: When using two SIM cards, carefully monitor which slot you are recording on. Data recorded on the second SIM card may not be displayed if the priority of the first card is selected in the call settings.
After selecting the transfer direction, the system will ask for confirmation. The interface may prompt you to select a saving format, but there are usually no options for a SIM card - the standard GSM protocol is used. If you see a message that says "Contacts already exist," the system will prompt you to replace the duplicates or skip them. Selecting a replacement (Overwrite) ensures that the card will contain current numbers, but old entries from the same SIM card will be permanently deleted.
Features of storage formats and data limitations
It is important for users to be aware of the technical limitations of the data storage format on the SIM card, which were laid down in the era of 2G networks. Unlike the internal memory of a smartphone or cloud storage Google Contacts, the SIM card chip does not support extended fields. When transferring, you will encounter truncation of information, which you need to be prepared for in advance.
The main problem concerns the length of the subscriber name. The GSM standard allows you to store a name up to 14 characters long in GSM 7-bit encoding, but in practice many Android 7 implementations limit this field even more strictly - to 10-12 characters. Long surnames and patronymics will be mercilessly cut off. In addition, it is impossible to store more than one number per name on a SIM card, whereas in a phone a contact can have five different numbers.
| Parameter | Internal memory / Google | SIM card |
|---|---|---|
| Max. name length | Up to 100+ characters | 10-14 characters |
| Number of numbers | Unlimited | 1 number per name |
| Contact photo | Supported | Not supported |
| Email and Address | Supported | Not supported |
| Call sounds | Individual | General ringtone |
It is also worth noting the problem of Cyrillic encoding. When transferring contacts between devices from different manufacturers or when using older SIM cards, Russian letters may appear as unreadable characters (krakozyabry). This is due to differences in the encoding tables UTF-8 and GSM 7-bit default alphabet. If you plan to use a SIM card in an old push-button phone, check the display of names in advance.
Why do contact photos disappear?
When exported to a SIM card, graphic data is not physically transferred, since the chip does not have capacity to store images. The photo is linked to an entry in the phone database or Google account.
Using third-party applications for migration
If standard Android 7 tools give errors or do not see the SIM card as a target device, you can use specialized software from the store Google Play. There are many utilities, such as Copy My Data, SA Contacts or Super Backupthat can work with contacts at a deeper level than the system application.
Such applications often allow you to first upload contacts to an intermediate format (for example, VCF), and then import them to SIM card in batches. This makes it possible to pre-edit names, reducing them to an acceptable length, and removing duplicates so as not to clog up the card memory. Working through the clipboard as a file reduces the risk of data loss if the direct write process fails.
- 🛠 Download a proven, highly rated contact management application.
- 📂 Create a backup copy in the format .vcf to internal memory.
- 📲 Use the app's import feature to write data from a file to SIM.
When using third-party software, be sure to grant the app all requested permissions to access your contacts and phone. No write permissions (WRITE_CONTACTS) the app will not be able to make changes to the SIM card database. Be careful with free versions of apps that contain advertising - an accidental click may start the cleaning process instead of copying.
Third-party applications are the best solution if you need to bulk edit names before writing to the SIM so that they are not cut off by the system.
Solving common problems and errors
Often users encounter a situation where the copy button is grayed out or the process ends with an error message. Most often, the reason lies in the fact that the contacts are not physically located in the phone’s memory, but are loaded from the account. In Android 7, you must first change the display: go to the contacts settings and select Display contactsby checking the box opposite Phone or Deviceexcluding Google.
Another common problem is a full SIM card memory. Even if you think there is a lot of space, deleted contacts can occupy memory cells until the sectors are completely overwritten. Try first clearing the SIM card of old unnecessary entries through the menu Contact management → SIM card → Delete. Only after freeing up space, repeat the copying procedure.
⚠️ Attention: If after transfer the contacts are not displayed in the call log, check the display settings. Go to Contacts → Settings → Contacts to display and make sure that “All contacts” or “SIM card” is selected.
In rare cases, the problem may be hardware: oxidation of SIM card contacts or a malfunction of the slot. Remove the card, wipe the chip with a soft (lint-free) cloth and insert it back until it clicks. If the phone detects the network, but does not see the card's memory for recording, the card itself may be damaged and requires replacement from the telecom operator.
What to do if names are displayed in hieroglyphs?
This is an encoding problem. Unfortunately, it is difficult to fix this on the SIM card itself. The best solution is to store contacts in your phone or Google, and on your SIM card keep only emergency dial numbers in Latin.
Frequently asked questions (FAQ)
Is it possible to transfer contacts from photos to a SIM card in Android 7?
No, the technical specification does not support SIM cards storage of graphic images. When transferring, contact photos will be lost, only text names and phone numbers will remain. Photos are stored exclusively in the internal memory of the device or linked to a Google account.
How many maximum contacts can a modern SIM card hold?
Capacity depends on the operator and type of chip. The standard range is from 250 to 500 records. Some new USIM cards can support up to 1000 numbers, but for exact information it is better to refer to the specifications of your telecom operator, as this is not regulated by a single Android standard.
What happens to the contacts on the phone after copying to the SIM?
When using the "Copy" function, the originals will remain in the phone's memory, and you will have a duplicate data on SIM card. If you select the "Move" function, the recordings will be deleted from the internal memory of the phone after successful writing to the chip. Carefully read the name of the button before pressing.
Why are some numbers not copied to the SIM card?
This can happen for two reasons: either the number contains characters that are unacceptable for the SIM format (for example, letters or special characters in the number field), or the card memory is completely full. Also, some operators prohibit recording international numbers in +7 format, requiring format 8.
Is it safe to store all contacts only on a SIM card?
No, this is not recommended. A SIM card is an unreliable storage device: it can get lost, demagnetized, or become unusable. In addition, when you change operator, you will most likely change your SIM card. The best option is to synchronize with a Google account, and use the SIM only as an emergency reserve.