Modern smartphones Samsung support work with two SIM cards, which allows you to separate personal and work numbers, save on roaming or use favorable tariffs from different operators. However, not all users know how to properly configure a second SIM card, avoid conflicts during calls, or distribute mobile traffic. This article will help you understand all the nuances - from the physical installation of the card to fine-tuning the network and eliminating common errors.

The Dual SIM function is available on most models Galaxy (starting from Galaxy A50 i Galaxy S10), but it can be implemented in different ways: through a hybrid slot (SIM + microSD) or two separate slots. It is important to understand that even if you have two SIM cards only one can work on the 4G/5G network at the same time the second one will switch to 2G/3G mode. This is a hardware limitation and cannot be circumvented. But you can intelligently set priorities so as not to miss important calls or messages.

If you are just planning to buy a smartphone with support for two SIM cards, pay attention to models with eSIM (for example, Galaxy S23 Ultra or Galaxy Z Fold5). A virtual SIM card allows you to use two numbers without a physical slot, but requires support from the operator. In this article we will look at both options - classic nano-SIM and eSIM.

📊 What do you use the second SIM card for?
Work and personal calls
Saving on roaming
Different tariffs operators
Testing services
Another option

1. Checking Dual SIM support on your smartphone

Before buying a second SIM card, make sure that your Samsung supports the Dual SIM function. Not all models are equipped with two slots - some budget devices (for example Galaxy A04 or Galaxy M13) have only one slot for a physical card.

To check compatibility:

  • 🔍 Look at the model's characteristics on the official website Samsung c "Network" or "SIM card" section. Look for mentions Dual SIM, Hybrid Slot or eSIM.
  • 📱 On the smartphone itself, go to Settings → SIM card management. If the section is missing, your device does not support two SIM cards.
  • 🛠️ Inspect the SIM card tray: if there are two separate slots or the inscription “SIM 1 / SIM 2”, then two physical cards are supported. The inscription "SIM or microSD" indicates a hybrid slot.

Please note: even if the smartphone supports two SIM cards some operators may block the operation of the second card in its networks (for example, when using corporate tariffs). Check this information with your provider.

⚠️ Attention: On models with hybrid slot (for example, Galaxy A52 or Galaxy S21 FE) you will have to choose between the second SIM card and memory card microSD. It is impossible to use both at the same time.
Samsung model Slot type eSIM support Max. speed 2nd SIM
Galaxy S24 Ultra Dual Nano-SIM + eSIM Yes 4G (with active eSIM)
Galaxy A54 5G Hybrid (SIM + microSD) No 3G
Galaxy Z Flip5 Nano-SIM + eSIM Yes 5G (only on the main SIM)
Galaxy M33 5G Dual Nano-SIM No 4G

2. Installing a second SIM card: step-by-step guide

If your smartphone supports two physical SIM cards, follow these instructions for installation. For models with eSIM the process will be different - it is described in the next section.

You will need:

  • 📲 Smartphone Samsung with support for Dual SIM.
  • 🪪 Two nano-SIM cards (if you are using a hybrid slot, one of them can be microSD).
  • 🔧 A paper clip or a special key for removing the tray (included with the smartphone).

Installation steps:

  1. Turn off the smartphone (required!). This will prevent damage to the slot contacts.
  2. Locate the SIM card tray - it is usually located on the top or side of the device. On some models (for example Galaxy Z Fold), the tray may be hidden under a cover.
  3. Insert a paper clip into the hole in the tray and gently press it to pop out. Do not use excessive force!
  4. Place SIM cards in the tray according to the markings. Pay attention to cut corner —it must match the shape of the socket.
  5. Insert the tray back until it clicks and turn on the smartphone.

After turning on, the device will automatically detect new SIM cards and offer to configure them. If this does not happen, go to Settings → SIM card management → Add SIM card.

Is the smartphone turned off?|

Does the SIM card size match the tray (nano-SIM)?|

Is there a cut on the corner of the card?|

Does the model support two physical SIM cards?-->

⚠️ Attention: If after installation the second SIM card is not detected, check:
  1. Is the card inserted correctly (the contacts must be facing down).
  2. Is there any physical damage to the card or tray.
  3. Is the SIM card activated by the operator (sometimes it takes time to register on the network).

3. Setting up eSIM on Samsung smartphones

Models Galaxy S22, S23, Z Flip/Fold 4/5 and newer support eSIM a virtual SIM card that does not need to be physically inserted into the device. This is convenient for traveling (you can quickly connect a local operator) or using a second number without losing the microSD slot.

To set up eSIM:

  1. Make sure that your operator supports eSIM (in Russia this is MTS, Beeline, MegaFon, Tele2). Foreign operators (for example Airalo or Holafly) also offer eSIM for roaming.
  2. Get QR activation code or data for manual entry from the operator. Usually they are sent by email or to your personal account.
  3. Go to Settings → Connections → SIM card management → Add mobile network.
  4. Select Add eSIM and scan the QR code or enter the data manually (number SM-DP+ Address and activation code).
  5. Confirm installation and wait for registration on the network (it may take up to 5 minutes).

Advantages of eSIM:

  • ✈️ Quick connection of foreign operators without purchasing a physical card.
  • 🔄 Ability to store multiple eSIM profiles and switch between them.
  • 📱 Freeing up the physical slot for a memory card.

On Samsung models with eSIM support, you can use up to 5 virtual profiles, but only two can be active at a time (including the physical SIM card).

How to remove an eSIM from your phone?

To remove an eSIM, go to Settings → SIM card management, select the desired profile and press Delete. The data will be erased without the possibility of recovery. If you plan to use the eSIM again, save the QR code or activation data.

4. Setting priorities: calls, SMS and mobile data

After installing the second SIM card, you need to configure which one will be used by default for calls, SMS and data transfer. This is especially important if you have different tariffs - for example, one SIM card has unlimited calls, and the other has cheap Internet.

To set priorities:

  1. Go to Settings → SIM card management.
  2. Select SIM card (click on its name).
  3. Configure the following parameters:
    • Calls: select the default SIM for outgoing calls.
    • SMS: specify the SIM card for sending messages.
    • Mobile data: select a SIM to transfer Internet traffic.
  • Activate the option Always askif you want to select a SIM card for every call or SMS.

    • For more flexible control:

    • 📞 In the application Phone when dialing a number, you can select a SIM card for a call by clicking on the SIM card icon next to the call button.
    • 🌐 In the notification panel, you can quickly switch mobile data between SIM cards by swiping down and holding the icon Mobile data.
    • 📶 In the network settings (Settings → Connections → Mobile networks) you can disable 4G/5G on the second SIM to save battery batteries.
    Parameter SIM 1 (main) SIM 2 (additional)
    Calls default Yes No (only in manual mode)
    SMS by default No Yes
    mobile data 4G 3G (automatic downgrade)
    Roaming Disabled Enabled (for travel)
    ⚠️ Attention: If the second SIM card is activated roaming, it can automatically connect to the Internet even if mobile data is disabled in the settings. To avoid unexpected expenses, go to Settings → Connections → Mobile networks → Data roaming and disable this option for an unnecessary SIM card.
    💡

    If you frequently while traveling, create shortcut for switching SIM cards on the main screen. To do this, hold your finger on an empty space on the screen → Widgets → SIM cards. This will allow you to quickly change priorities without going into the settings.

    5. Solving typical problems with the second SIM card

    Even with proper setup, users encounter problems: one of the SIM cards does not connect to the network, the Internet disappears, or calls go through only one card. Let's look at the most common errors and how to fix them.

    Problem 1: The second SIM card is not detected

    • 🔄 Reboot your smartphone - sometimes this helps the system reinitialize the card.
    • 🪪 Check whether the SIM card is activated by the operator (especially if it is new).
    • 🛠️ Remove and reinsert the card into the tray, making sure that the contacts are not contaminated.
    • 📱 Update the smartphone software: go to Settings → Software update.

    Problem 2: There is no network on one of the SIM cards

    • 📡 Check the operator's coverage area on the website provider.
    • 🔧 Go to Settings → Mobile networks → Mode network and select Auto or LTE/3G/2G for the problematic SIM card.
    • 🔄 Turn on and off Airplane mode for 30 seconds.
    • 📶 If the network disappears only in certain places, it may be due to overloading of the base station operator.

    Problem 3: Calls and SMS come only to one SIM card

    • 📞 Make sure that in the call settings (Settings → SIM card management → Calls) priority is not set for one SIM card.
    • 🔄 Check whether the service is activated "Call forwarding" with the operator.
    • 📱 In some models Samsung there is a bug when the second SIM card “falls asleep” after prolonged inactivity. To wake her up, make an outgoing call.

    If none of the methods help, contact support Samsung or the operator. The problem may be related to hardware failure slot or communication module.

    💡

    Before contacting the service center, check the operation of the SIM card on another device. If it is not detected there either, the problem is in the card, not in the smartphone.

    6. Optimizing battery consumption when using two SIM cards

    Working with two SIM cards increases the load on the smartphone's communication module, which can lead to accelerated battery drain. This is especially noticeable if both SIM cards are active in 4G/5G networks. Here are some ways to save power:

    Tips for saving energy:

    • 🔋 Disable 4G/5G background mode for the second SIM card if it is used only for calls. To do this, go to Settings → Mobile networks → Network mode and select 3G/2G for an additional SIM card.
    • 📴 Enable Power saving mode (Settings → Device care → Battery → Power saving mode). This will limit background activity, but will not affect calls.
    • 🔄 Set automatically turn off mobile data for the second SIM cards at night (use the application Digital Wellbeing or Bixby Routines).
    • 📶 Disable network search for an unused SIM card in roaming: Settings → Mobile networks → Network search → Manual.

    If you notice that the battery is draining too quickly, check the consumption statistics in Settings → Device care → Battery → Battery usageIf the module SIM cards consumes more than 10% of the charge, try disabling one of the cards for a while or resetting the network settings (Settings → General → Reset → Reset network settings).

    ⚠️ Attention: On some models Samsung (for example, Galaxy A73) with two active SIM cards, it can disable 5G support on the main SIM card. This is due to chipset limitations. To get 5G back, disconnect the second SIM card or restart the device.

    7. Using two SIM cards for roaming and traveling

    One ​​of the most popular reasons for using two SIM cards is saving on roaming. For example, you can leave the main SIM card for incoming calls, and the second one with a local tariff for the Internet and outgoing calls. Here's how to properly set up a smartphone for travel:

    Preparation before the trip:

    • 🌍 Check with your operator for roaming conditions. Some tariffs (for example, "Travel easily" from MegaFon) allow you to use the Internet abroad without additional charges.
    • 📱 Buy local SIM card or activate an eSIM with a tariff for tourists (for example, Airalo or Holafly).
    • 🔧 Configure data priorities: disable mobile data on the main SIM card and leave it only on local.

    Roaming settings:

    1. Go to Settings → Mobile networks → Data roaming and enable this option only for local SIM card.
    2. Disable automatic network selection and manually select the local operator (Settings → Mobile networks → Network operators → Select manually).
    3. Activate the option "Only 3G networks" for the main SIM card to reduce battery consumption.
    4. Use Wi-Fi Calling (if supported by the operator) to make calls via the Internet and save money.

    Example of settings for a trip to Turkey:

    • 🇷🇺 Primary SIM (Russian operator): calls and SMS by default, mobile data disabled, data roaming Main SIM data off.
    • 🇹🇷 Local SIM (For example, Turkcell): mobile data included, data roaming enabled, priority for the Internet.

    On Samsung models with eSIM support, you can pre-install a foreign operator profile and activate it upon arrival without purchasing physical card.

    8. Alternative ways to use a second SIM card

    Two SIM cards on a smartphone Samsung can be used not only for calls and the Internet. Here are a few non-obvious scenarios:

    1. Separation of work and personal life

    • 💼 Set up different ringtones for each SIM card to immediately understand whether it is a work call or a personal one.
    • 📱 Use the application Samsung Secure Folder for storing work contacts and messages linked to the second SIM card.
    • 🕒 Set availability schedule via Bixby Routines: for example, turn off notifications from the work SIM card after 18:00.

    2. Testing applications and services

    • 🧪 If you are a developer, a second SIM card will allow you to test SMS mailings or calls without risking the main number.
    • 📊 Use different SIM cards to register in services that require confirmation by phone (for example, Telegram, WhatsApp).

    3. ​​Backup communication channel

    • 🆘 The second SIM card of another operator can become a backup communication channel in case of network failures.
    • 📡 Configure call forwarding from the main SIM card to the backup one if the first one is unavailable.

    4. Using bonuses and promotions

    • 🎁 Some operators offer bonuses for installing their SIM card (for example, free Internet or minutes). The second SIM card will allow you to take advantage of these promotions.
    • 💰 Set up automatic replenishment for the second SIM card with bonus tariffs (for example, "Free communication" from Tele2).

    If you use a second SIM card for non-standard tasks, pay attention to the privacy settings. For example, in Settings → Privacy → Permissions you can limit application access to the information of the second SIM card.

    💡

    For maximum security, set up two-factor authentication (2FA) on both SIM cards. This will protect your accounts even if one of the SIM cards is lost or blocked.

    Frequently asked questions (FAQ)

    Is it possible to use two SIM cards and a memory card at the same time on Samsung?

    No, if your smartphone is equipped with hybrid slot (for example, Galaxy A53 or Galaxy M52In this case, you will have to choose between). a second SIM card and microSD. Models with two separate slots (for example, Galaxy S23 Ultra) allow you to use two SIM cards and a memory card.

    Why does the second SIM card only work in 2G, even if it supports 4G?

    This is a hardware limitation of most smartphones Samsung with Dual SIM only one SIM card can work in 4G/5G networks, the second one automatically switches to 3G or 2G. To return 4G to the second SIM card, turn off mobile data on the first one.

    How to transfer contacts from one SIM card to another?

    Open the application Contact, click on the three dots (menu) → Contact management → Import/Export. Select Import from SIM card, specify the source and target SIM card. Alternatively, export contacts to file VCF and import them to another SIM card.

    Is it possible to make calls through both SIM cards at the same time (conference call)?

    No, smartphones Samsung do not support simultaneous calls from two SIM cards. If you receive a call on the second SIM card while talking on the first one, the call will be forwarded to voicemail (if the service is activated by the operator).

    What to do if the second SIM card stops working after a software update?

    Update eSIM profile (if you are using a virtual card) or reboot your smartphone. If the problem persists:

    1. Check the APN settings for the second SIM card (Settings → Mobile networks → Access points (APN)).
    2. Reset network settings (Settings → General → Reset → Reset network settings).
    3. Contact support Samsung —there may be a bug in the firmware that needs to be fixed.