Owners of modern smartphones are often faced with the need to manage several telecom operators simultaneously. Situations can be different: you want to save on roaming, temporarily avoid calls to your work number, or simply check the quality of communication from a second operator. In older phone models, the only way out was to physically remove the card from the tray, which required a paperclip and was extremely inconvenient on the road.
Today, the operating system Android in combination with the proprietary shell One UI from the company Samsung provides much more flexible options. You can programmatically deactivate any of the slots directly from the settings menu in a matter of seconds. This allows you to instantly switch the operating modes of the device without subjecting the card tray to mechanical stress or losing a small part in the grass.
In this guide, we will analyze in detail the process of disabling one SIM card on different versions of the interface. We will look at not only standard methods, but also the nuances of working with mobile data and voice calls, which often cause confusion among users.
Preparing to change communication settings
Before you start manipulating network settings, make sure that your smartphone is turned on and unlocked. Access to managing SIM cards is in the system menu, so you will need standard access to the interface without any special rights or developer modes. It is important to understand that deactivating a card programmatically does not delete contacts or call history associated with this number.
If you plan to disable a card that is currently used for data transfer (Internet), you should prepare in advance for loss of connection. At the moment of switching, the phone will automatically try to restore communication through the remaining active card, if mobile data is configured on it. Otherwise, the 4G or 5G icon in the status bar will disappear and the device will go into Wi-Fi standby mode.
⚠️ Attention: If you are in an area of poor signal reception, disconnecting the second SIM card may temporarily disrupt the operation of the first due to the re-registration of the device on the network. It is recommended that you perform these steps in an area with stable coverage.
It is also worth checking the battery charge level. Although changing settings takes seconds, the process of reconnecting to cell towers can require more power from the smartphone's modem, resulting in spikes in power consumption. Make sure you have at least 15-20% charge to complete the operation safely.
Search for the SIM card management menu
Interface One UI on smartphones Samsung may vary slightly depending on the version Android and device model (for example, Galaxy S23 against Galaxy A54). However, the menu layout logic remains the same for the entire brand ecosystem. You need to get to the section responsible for connections.
The fastest way is to use the search bar in the settings. Simply swipe down the notification shade, tap the gear icon, and type “SIM” into the search field. The system will instantly offer the item SIM Card Manager or SIM Card Management. This is a universal method that saves time and eliminates the need to wander through nested menus.
If you prefer to manually search, follow this path: go to Settings, then select section Connections. This is where all the parameters related to Wi-Fi, Bluetooth and mobile network are concentrated. In the top or middle part of the screen you will see the desired control point.
- 📱 Open the application Settings on the desktop.
- 🔗 Go to the section Connections (Connections).
- 📶 Find the item SIM card manager (SIM manager).
- ⚙️ Alternative path: Settings → General settings → Manager SIM cards (on some older models).
Inside this menu you will see a visual display of both installed cards. Usually they are designated as SIM 1 and SIM 2, or have the names of operators if the phone has time to read them. Next to each card there is a switch, the state of which (active/inactive) is displayed in color.
The process of disabling a specific SIM card
After entering the menu SIM Card Manager you will see a list of available slots. To disable one of them, just click on the toggle switch opposite the corresponding number. The interface will respond instantly: the switch color will change from blue (active) to gray (inactive), and the network icon in the status bar will update.
Please note that when you disable the card, the system may ask you to confirm the action. This is a standard measure of protection against accidental clicks. Confirm your choice by clicking Turn off or OK in the pop-up window. After this, the communication module responsible for this slot will go into power saving mode.
If you use two cards from the same operator, carefully monitor which one you turn off. The menu often displays the last four digits of the phone number or the name of the operator. An error may result in you being left without communication on the main number, while the secondary number continues to work.
☑️ Check before disconnecting
It is worth noting an important technical point: on some smartphone models Samsung with technology Dual SIM Dual Standby disable one card can free up antenna resources for another. This could theoretically improve the reception quality of the remaining SIM card in areas of uncertain signal, since the modem does not need to constantly switch between two networks.
⚠️ Attention: On devices with a hybrid slot (SIM 2 / microSD), disabling the second SIM card in the menu will not free up the memory card slot. It is impossible to physically remove one and insert the other without turning off the phone.
mobile data and call management
Disabling a SIM card affects not only the ability to receive calls, but also the operation of mobile data. By default, smartphones Samsung are configured with one main card for data transfer. If you disable it, the Internet will disappear completely until you switch this function to the second active card or enable the disabled one back.
To change the card for the Internet, being in the same menu SIM Card Manager, find the section Mobile Data. Click on it and select the remaining active SIM card from the list. The system will warn you that data transfer will be switched and ask for confirmation.
| Action | Impact on SIM 1 | Impact on SIM 2 | Result |
|---|---|---|---|
| Disable SIM 1 | No connection | Working | Calls and SMS only on SIM 2 |
| Disable SIM 2 | Working | No connection | Calls and SMS only on SIM 1 |
| Change data on SIM 2 | Calls only | Internet + calls | Internet works via SIM 2 |
| Disable both | No connection | No connection | Airplane mode (partial) |
It is also important to set up a preferred card for outgoing calls. In the call management menu, you can select the option Always ask, Last used or assign a specific SIM card for all calls. This is especially convenient when one of the cards is disabled, so that the phone does not try to make a call through an inactive channel.
If you often switch the Internet between cards, add the "SIM Settings" widget to your desktop for quick access without entering the deep menu.
Features of working in roaming
Travelers often wonder how to avoid huge bills for communication abroad. The most effective method is to disable your local SIM card or home operator card, leaving only the one with the purchased special roaming package active. However, there are pitfalls here.
When crossing the border, the smartphone begins to search for available networks. If you have two cards inserted, the phone will register both in roaming. This may result in you receiving welcome SMS from local operators, which are chargeable in some countries. Disabling the second card completely eliminates this risk.
Don't forget to check your data settings while roaming. Even if the SIM card is active, data transfer may be blocked at the system level. Go to Settings → Connections → Mobile networks and make sure that the switch Data transfer while roaming is turned off for a card that you do not plan to use for the Internet.
⚠️ Attention: Tariffs and roaming conditions are constantly changing. Before your trip, be sure to check the current terms and conditions for connecting services with your telecom operator, since your phone settings cannot cancel the provider’s tariffs.
Using the function Wi-Fi Calling can be an excellent alternative. If you have turned off mobile data on the second SIM card, but are connected to Wi-Fi, you can still receive and make calls through this card if the operator supports this technology. This allows you to stay in touch without using up expensive mobile traffic.
Possible problems and solutions
Sometimes users are faced with a situation where, after disconnecting one SIM card, the second one stops seeing the network or the phone begins to behave unstable. Most often, this is due to a software failure in the operation of the radio module, which did not have time to correctly adjust to working with one communication channel.
The first step in solving this problem should be a simple reboot of the device. Turn off your smartphone completely, wait 10-15 seconds and turn it on again. This will initiate a full re-registration with the cellular operator's network and reset temporary configuration errors.
If the problem persists, check to see if the mode is enabled Flight. Sometimes users accidentally activate it while trying to disable just one card. Make sure the airplane icon in the notification shade is inactive. It is also worth checking whether third-party applications are installed for managing calls, which may conflict with system settings Samsung.
What to do if the phone does not see the network after turning it back on?
If the network does not appear after turning on the SIM card again, try manually selecting the operator. Go to Settings → Connections → Mobile networks → Network operators → Disable auto-selection. Wait for the phone to find available networks and select your operator from the list. If this does not help, remove and insert the SIM card physically.
In rare cases, the problem may lie in the SIM card itself. Old Mini-SIM cards cut to fit Nano-SIM may have unstable contact. If turning off and on the card through the menu does not help restore communication, you may need to replace the SIM card in the operator's salon with a new one.
Software disabling a SIM card is a safe way to manage communications that does not require removing the tray and saves all network settings in the device memory.
Frequently asked questions (FAQ)
Will SMS messages be sent to a disabled SIM card?
No, when you disable a SIM card through the settings, it stops registering with the operator’s network. At this moment, your phone with this number becomes unavailable to the network. All incoming SMS and calls will be blocked by the operator or forwarded to voicemail if this service is activated. You will receive them only after you turn on the card again.
Is it possible to disable the SIM card with a password for greater security?
Yes, in the same menu SIM card manager you can enable the request PIN code. If you activate this function, then every time you reboot the phone or when you try to turn on the card, the system will require you to enter a code. This protects your SIM card from being used if your phone is stolen, since you won’t be able to turn on the card without a code.
Does disabling the second SIM card affect the speed of the phone?
In theory, disabling the second SIM card can slightly reduce the load on the processor and modem, since the device does not need to constantly search for the network and register for the second number. However, on modern powerful smartphones Samsung this difference is almost unnoticeable in everyday use and does not affect the speed of opening applications.
What happens if you turn off the SIM card during a call?
The system Android usually blocks the ability to turn off the active SIM card during a voice call. The switch in the menu will be inactive (grayed out). If you manage to forcibly disable the communication module (for example, through the engineering menu or third-party software), the call will be interrupted instantly and the connection will be severed without the possibility of restoration.
How can you find out which SIM card is currently disabled?
Visually this can be determined by the status bar: only one signal level icon will be displayed there instead of two. For an accurate check, go to Settings → About the phone → Information about SIM cards. The status of each card will be indicated there: “Connected” or “Disabled”, and the status of the mobile data will also be displayed.