Modern smartphones have long ceased to be just a means of communication, turning into multifunctional centers, but the basic function of calls remains critically important. For many users, having two SIM cards is not just a convenience, but a necessity, allowing you to separate work and personal contacts or save on tariffs from different operators. Despite the prevalence of dual-SIM devices, the question of how to make calls correctly and quickly from the second SIM card often causes difficulties for owners of new devices or those who have changed the smartphone brand.
Operating system interfaces Android are constantly changing, and the paths to the settings may differ depending on the shell version manufacturer. In one case, switching occurs automatically when you select a contact, in the other, it requires manual intervention before each dial. Understanding the logic of operation multi-SIM mode will help you avoid missed important calls and unnecessary costs for long-distance communication if you forgot to switch the profile.
In this article we will analyze in detail all aspects of managing calls from the second SIM card: from basic actions in the dialing menu to deep setting of priorities and solving typical technical failures. You will learn how to assign an operator to a specific contact so that the system does not ask you every time, and what to do if the call button with SIM 2 is simply inactive. A deep dive into communication settings will allow you to fully control the communication processes of your gadget.
Basic methods of initiating a call from the second SIM
The most obvious and frequently used method is to select an operator directly at the time of dialing. When you open the application Phone and enter numbers, the screen usually displays two large call buttons. They can be signed with the names of the operators (for example, MTS, Beeline) or designated as SIM 1 and SIM 2. Clicking on the corresponding button instantly initiates a connection through the selected network.
However, the visual design of these buttons may vary. In some shells, such as MIUI from Xiaomi or One UI from Samsung, the buttons can be located horizontally under the number entry field, while in pure Android they are often duplicated or require an additional tap to select. If you don't see the second button, it's possible that the second SIM card is disabled in settings or is in a no-signal area.
An alternative way is to use the context menu in your call history or contacts list. When you click on a contact's name in your address book, the system may offer a choice if that contact is not set to hard priority. This is especially convenient when making callbacks from the log of missed events, where a mark of which SIM card you were called on is often saved.
It is worth considering that when dialing emergency numbers (112, 102, 103), the smartphone will automatically select the SIM card that has the best signal at the moment, ignoring your preferences. This is a critical security feature built into communication protocols, and it is impossible to change its behavior using standard means. GSM/LTE connection, and it is impossible to change its behavior using standard means.
Setting priorities and assigning SIM to contacts
To save yourself from the need for constant manual selection, it is advisable to set up call rules globally or for individual subscribers. In the phone settings menu, usually in the Settings → SIM cards and mobile networkssection, you can set the default SIM card for voice calls. This means that when you click on the green handset in contacts, the call will go through the selected line, unless otherwise specified.
A more flexible approach is to assign an operator to a specific contact. Open the card of the desired person in the phone book. At the top of the screen or in the action menu (three dots), find the item Always use SIM or similar. By selecting a second SIM card there, you guarantee that all calls to this subscriber will go through it, regardless of the general phone settings.
☑️ Setting call priority
This function is extremely useful for separating communication streams. For example, you can configure it so that all calls to your bosses and colleagues are made through a work SIM card with a corporate tariff, and to relatives and friends - through a personal one. The system remembers this choice and applies it automatically, saving you time and nerves in a hurry.
⚠️ Attention: If you change the physical SIM card in the slot (for example, rearrange the cards), the binding in contacts may get lost, since the phone identifies the slots, not the cards themselves. After rearranging, check your favorite contacts settings.
There is also a Smart Select feature available on some devices. The smartphone analyzes call history: if you have always called a specific person with SIM 2, the system will offer to remember this choice. Refusal of such offers may result in the phone asking you every time you dial, which becomes annoying over time.
Features of interfaces from different manufacturers
Android shell developers implement multisim control in different ways, which often confuses users who have changed the device brand. Understanding these differences helps you quickly navigate the menu and find the necessary switches without long searches.
In devices Samsung with a shell One UI selecting a SIM card is often implemented through a pop-up window that appears when you press the call button if the priority is not set. The window contains large operator icons. At the same time, in call logs there may be a small mark next to the subscriber's name indicating which SIM card was last used. Pressing this mark again allows you to quickly change the operator for the next call.
Smartphones Xiaomi, Redmi i Poco (shell MIUI/HyperOS) offer more aggressive control. Here you can often set up “Call Rules”, where you can specify that calls abroad should always go with SIM 1, and local calls with SIM 2. Also, in dialing mode, the switch buttons can be placed in a separate panel above the numbers.
| Brand / Shell | Location of selection buttons | Feature settings | Auto-select option |
|---|---|---|---|
| Samsung (One UI) | Pop-up window or mark in the log | Remembering the last choice for a contact | Yes (by contact) |
| Xiaomi (MIUI) | Two buttons below the input field or above them | Flexible rules for roaming and city | Yes (smart rules) |
| Google Pixel (Stock) | Switch above the call button | Minimalistic interface, without unnecessary rules | Only global priority |
| Huawei (EMUI) | Two separate call buttons | Ability to disable one of the buttons | Yes |
Hidden settings for advanced users
In the engineering menu of some phones (call via code ##4636##), you can force the preferred network type for each SIM separately, which may affect the connection speed when calling, but is not recommended for ordinary users.
Devices from Google (series Pixel) and other pure devices Android adhere to strict simplicity. There are no complex routing rules here. You either select a SIM card manually before making a call, or set one main one for all outgoing calls. This reduces the likelihood of an error, but reduces the flexibility of control.
Solving problems with an inactive second SIM card
The situation when you try to call with SIM 2, but the button is inactive, gray or the system gives a connection error, occurs quite often. The first step is to check the physical condition of the card and slot. Make sure that the SIM card is installed correctly, the contacts are not oxidized, and the tray is closed until it clicks. Sometimes it is enough to simply remove and reinsert the card.
The next step is to check the status in the software. Go to Settings → Connections → SIM card manager. Make sure that the switch opposite the second SIM card is active (lit blue or green). If the slider is gray, turn it on. If the system writes “No service” or “Emergency calls only,” the problem may be on the operator’s side or in network coverage.
If the second SIM card is used only for incoming or infrequent calls, disable mobile data in its settings. This will significantly save battery power and prevent background traffic consumption.
A frequent cause of failures is a conflict of network types. If the mode is forced in the settings for SIM 2 5G/LTE, but only 3Gworks in your area, calls may not go through. Try changing the preferred network type to 2G/3G/4G (auto) in the mobile network settings for the problematic SIM card.
⚠️ Attention: In some regions and with some operators, support for voice calls over the 4G network (VoLTE) may not be possible disabled or not working correctly. If calls are interrupted, try temporarily disabling the VoLTE function in the SIM card settings.
It is also worth checking whether outgoing calls are blocked. In the phone application, through the settings menu (three dots), there is often a section Blocked numbers or Call restrictions. Make sure that you have not accidentally activated outgoing barring for the second line, which sometimes happens when resetting the settings or updating the software.
Using a voice assistant for calls
Modern smartphones allow you to manage calls voice, which is especially convenient while driving or when your hands are busy. Voice assistants, such as Google Assistant or Bixby, support commands for selecting a specific SIM card. This eliminates the need to poke at the screen and look for the right button.
To make a call, just say: “Okay, Google, call [Contact Name] on the second SIM card.” The assistant recognizes the command and initiates a call through the desired slot. If you do not specify a SIM card, the assistant will use the one that is set by default in the system, or ask you a clarifying question.
The effectiveness of this method depends on the quality of speech recognition and the correctness of the names in your phone book. If the contact is written in a complex way or in a foreign language, the assistant may make a mistake. In this case, it is better to use standard dialing, but for simple commands (“call your mother on the second”) this method works flawlessly.
Voice control is the safest way to make a call from the desired SIM card while driving, since it does not require visual contact with the smartphone screen.
It is important to note that for this feature to work, the microphone must be working properly, and permission to use the microphone for the assistant must be granted. You can check this in the section Settings → Applications → Google → Permissions. Without access to the microphone, voice dialing will not work.
Technical nuances and influence of airplane mode
Airplane mode is a powerful tool for rebooting radio modules, which often helps restore communication if Sim 2 "fell off." Turning this mode on and off via the quick settings panel forces the phone to re-register with both operators' networks. This is the first action that should be taken if there is a sudden loss of signal on the second line.
However, it is worth remembering the nuances of the operation of two active SIM cards. Most modern smartphones implement DSDS (Dual SIM Dual Standby) technology. This means that both cards are active for receiving calls, but when talking on one of them, the second one temporarily becomes unavailable (the subscriber will be told “the subscriber is unavailable”).
There are more advanced chipsets with support DSDA (Dual SIM Dual Active), allowing you to talk on one SIM card and receive a call on another, but such devices are rare and expensive. Understanding this limitation will help you adequately assess the situation when you did not get through to the second line during a conversation on the first.
⚠️ Attention: When the modem mode is active (distributing the Internet via Wi-Fi) on some phone models, the second SIM card may automatically switch to 2G mode or temporarily lose the ability to make voice calls. This is a limitation of the hardware, not the app.
Also, the operation of the second SIM card can be affected by installed third-party software for calls. If you use applications like Truecaller or enterprise IP telephony, they can intercept call control. In case of problems, try temporarily disabling such applications and check the operation of standard dialing.
Frequently asked questions (FAQ)
Why don’t I see the second call button when dialing a number?
This can happen for several reasons: the second SIM card is disabled in the settings, inserted incorrectly, or the hard priority “Always use SIM 1” is set in the phone settings. Check the status of the card in the settings menu and try resetting the priority to “Always ask”.
Is it possible to set different ringtones for calls to SIM 1 and SIM 2?
Yes, most modern Android shells allow you to assign different ringtones for each SIM card. Go to Settings → Sounds and vibration → Ringtone. There you will see separate items for SIM 1 and SIM 2. This will help you understand, without taking the phone out of your pocket, which line they are calling you on.
Does the choice of SIM card affect the quality of communication during a call?
The quality of communication depends solely on the level of the operator’s signal and the load on the tower at the moment, and not on which button you pressed. However, if one SIM card operates in 4G (VoLTE) mode, and the second only 2G/3G due to settings or coverage, then the voice quality will be better on the first. Check the network icons next to the SIM card indicators.
What to do if the second SIM card constantly loses the network?
Try to rearrange the SIM cards in the tray. If the problem goes to another slot, the problem is in the card itself (wear of contacts) or the tariff. If the problem remains in the same slot, the phone's radio module or the antenna for this slot may be faulty. Also update the device firmware.
Can I make calls via WhatsApp from a specific SIM card?
WhatsApp uses an Internet connection. If mobile data is enabled on SIM 2, then calls in the messenger will go through it (using its IP address). However, the phone number itself, linked to a WhatsApp account, cannot be changed on the fly - it is assigned during registration. For calls within the application, the choice of SIM card is important only for traffic consumption.