Why you can’t make calls from an Android smartphone: technical reasons and solutions

Introduction: when a smartphone refuses to call

You are trying to make a call from your Androiddevice, but instead of beeps you hear silence, a network error or the message "Calling" impossible." The situation is familiar to many - according to statistics, every fifth smartphone owner has encountered telephone connection problems at least once. The reasons can vary from trivial (dead battery) to complex (hardware failure of the communication module).

In this article we will analyze 7 main reasonswhy Androidthe smartphone cannot make an outgoing call, and also give step-by-step guide for diagnosing and troubleshooting. We will pay special attention to cases where the problem occurs selectively - for example, you cannot call only certain numbers or while roaming. The material will be useful for both beginners and experienced users who want to understand the technical nuances of mobile communications.

Before moving on to complex manipulations, check the obvious: whether the "Airplane" mode is activated, whether the installed application is blocking calls (for example, Truecaller or built-in "Do not disturb"), and whether there are enough funds in the account. These three points solve 40% of problems with outgoing calls.

1. Problems with the SIM card: from lack of network to blocking

The most common reason for the inability to make calls is a malfunction or incorrect installation SIM cards. Even if the network indicator shows a signal, this does not guarantee that voice communication will work. Here are the key signs of problems with SIM:

• 📶 There is no network or the signal is constantly “blinking” (it appears and then disappears)
• 🔄 The phone asks to enter the PUK code after several unsuccessful attempts to enter the PIN
• 🚫 The message "SIM card is not supported" or "Network registration error"
• 🔧 In the settings, IMEI is displayed as "unknown" or "0"

The first thing you need to do is restart the smartphone and wait for re-registration on the network. If this does not help, remove the SIM card and inspect it for physical damage (scratches, chips, dirt). Pay special attention chip - if it is scratched or has traces of oxidation (green coating), the card will have to be replaced.

Remove the SIM and clean the contacts with a dry cloth|

Try inserting the card into another smartphone|

Make sure the SIM tray is closed correctly (should click)|

Check if the "4G/5G Only" mode is activated (may block 2G/3G calls)-->

If The SIM card is visually working, but the network does not pick up, try manually selecting an operator in the settings: Settings → Connections → Mobile networks → Network operators → Network search.

In some regions, automatic selection does not work correctly, especially in roaming.

⚠️ Attention: If after After entering the PIN code, the phone requests PUK, do not enter the code at random - after 10 incorrect attempts, the SIM card will be blocked forever. PUK is indicated on the plastic carrier that came with the card, or it can be obtained from the operator.

2. Blocking by the operator: restrictions, debts and technical work

Telecom operators can restrict outgoing calls for several reasons. The most common:

• 💰 Negative balance (even if you have an unlimited tariff, some operators block calls if you are in debt)
• 📵 Technical work at the station (usually accompanied by an SMS notification)
• 🔒 Blocking on request (for example, if the phone is on the wanted list)
• 🌍 Roaming restrictions (in some countries, operators turn off calls for tourists by default)

To check the status of your line:

1. Try to call the operator's short number (for example, *111# for MTS, *100# for Beeline). If it doesn’t work, the problem is definitely on the operator’s side.
2. Send a USSD request to check the balance (for example, *100#). If an answer comes, there is no blocking; if there is an error, the line is blocked.
3. Call your number from another phone. If you hear “the subscriber is temporarily unavailable,” this may mean blocking.

If you suspect blocking, contact the operator through alternative channels:

- Online chat on the official website

- Social networks (VKontakte, Telegram)

- Personal account on the website operator

- Sales office

Never|

1-2 times a year|

Every month|

Constantly, I change operator-->

3. Software failures: from updates to viruses

Modern Androidsmartphones depend on the software no less than on the hardware. Errors in the firmware, application conflicts or malware can completely paralyze the telephone function:

• 📱 Calls are dropped 1-2 seconds after dialing
• 🔄 After dialing the number, the screen goes blank or reboots
• 🛑 The message "Process error com.android.phone" appears
• 📵 The network indicator shows a signal, but calls are not made

The first step is reboot in safe mode. This will help determine whether a third-party application is to blame: Hold the power button → Long press to "Turn off" → "Safe Mode".

Only system applications work in this mode. If calls work, the problem is in one of the installed applications (most often it is Truecaller, Dual Apps or memory optimizers).

If safe mode does not help, try the following:

Update the firmware to the latest version (Settings → System → Software update)|

Reset network settings (Settings → System → Reset → Reset mobile network)|

Clear the cache of the "Phone" application (Settings → Applications → Phone → Memory → Clear cache)|

Uninstall recently installed applications (especially those that requested access to calls)-->

For advanced users: if crashes started after updating the firmware, you can try to roll back to the previous version via fastboot or Recovery Mode. However, this is a risky procedure - if done incorrectly, the phone can turn into a “brick”.

⚠️ Attention: If after resetting the settings the problem remains, and entries aboutSettings → System → Error logs), this may indicate damage to system files. In this case, only flashing via Radio Interface Layer (RIL)appear in the logs ( Fastboot.

4 will help. Hardware faults: from the antenna to the motherboard

If software methods do not help, the problem is most likely in the hardware. Android-smartphones have several nodes responsible for telephone communication:

• 📡 Antenna module (may come off after a fall or moisture)
• 🔌 SIM card connector (oxidation of contacts or mechanical damage)
• 📱 Communication module (modem) on the motherboard (fails when overheated)
• 🔋 Communication module power supply (power circuit malfunction)

It is difficult to diagnose a hardware fault on your own, but there are several tests:

1. Checking IMEI: dial *#06#. If “unknown” or zeros are displayed instead of the 15-digit code, there is a problem with the modem.
2. Network test: in the engineering menu (for Samsung: #0011#, for Xiaomi: ##4636##*) check the status Service State. If there is "Out of Service" - the antenna or modem is faulty.
3. Checking the heating: while trying to make a call, touch the top of the phone (where the antenna is located). If it gets very hot, the circuit may break.

Typical scenarios of hardware failures:

If you suspect a hardware malfunction, Do not try to disassemble the phone yourself - modern smartphones have fragile cables and microcircuits that can be easily damaged without special equipment. Contact the service center, having previously made a backup copy of the data (if the phone still turns on).

5. Conflicts with Dual SIM and eSIM: why one SIM rings and the other does not

Smartphones with support for two SIM cards (Dual SIM) or eSIM often encounter problems with the distribution of network resources. Typical situations:

• 📞 One SIM can make calls, and the second can only receive calls
• 📶 4G works only on one SIM, and the second one “does not catch” the network
• 🔄 After a reboot, the "second" SIM and the second SIM change places
• 🚫 eSIM is not registered on the network, although the physical SIM works

In most cases, the problem is solved by setting SIM card priorities. Go to: Settings → Connections → SIM card manager

Here you can:

• 🔄 Install priority SIM for calls (on some phones this is called "SIM for voice communication" default")
• 📶 Enable/disable 4G/5G for each SIM separately (sometimes calls do not work if 2G/3G is disabled on the SIM)
• 🔒 Disable feature "Double call" (it may conflict with some operators)

For eSIM additional steps:

1. Make sure that profile eSIM activated (in the settings you should see "Ready" next to the operator).
2. Check whether your operator eSIM supports voice communication (some operators allow only the Internet).
3. If eSIM is not registered, try deleting and loading the profile again (in the settings eSIM there is a "Delete" option).

⚠️ Attention: On some phones (for example Samsung Galaxy S22 and newer) when active eSIM the physical SIM may automatically disconnect from the voice communications. This is a firmware feature - check the priority settings.

6. Blocking by geolocation: roaming, sanctions and local restrictions

In some cases, the inability to make calls is not related to the phone, but to geographical restrictions. This is relevant for:

• 🌍 Travelers in roaming (some countries block incoming/outgoing calls for foreign SIMs)
• 🏛 Users in government agencies or military zones (where government blocks apply)
• 📵 Subscribers of operators subject to sanctions (for example, in Crimea or DPR/LPR)
• 🚫 Phones with IMEI on the blacklist (stolen or uncertified devices)

How to check if calls are blocked by geolocation:

1. Try to call via Wi-Fi Calling (if the function is supported by your operator). If the call goes through, the problem is definitely in the mobile network.
2. Insert a local SIM card. If calls work with it, your operator is blocking roaming.
3. Check the IMEI status on the website SNDdeep (for Russia) or IMEI.info (international). If the status is "blacklisted" - the phone is blocked.

Solutions for different scenarios:

If you travel frequently, check with your operator about roaming conditions in advance. Some tariffs (for example, "Travel easily" from MegaFon) include free minutes for calls from abroad, but they need to be activated in advance.

7. Alternative ways to make a call if all else fails

If all of the above methods did not work, and you urgently need to call, use alternative communication channels:

• 💬 Messengers with voice calls:
  • WhatsApp (works even when SMS is blocked)
  • Telegram (supports voice chats and video calls)
  • Viber (good call quality, but requires registration)
• 📞 IP telephony:
  • Skype (paid calls to mobile/landline numbers)
  • Google Voice (free calls to USA/Canada, paid - to other countries)
  • Zoiper (SIP client for calls via VoIP)
• 📡 Wi-Fi Calling (if supported by the operator):
  • Activated in Settings → Connections → Wi-Fi Calling
  • Works through any Wi-Fi network, even without a mobile signal

For emergency situations:

• 🚨 Use SOS mode (on some phones it allows you to call 112 even without a SIM card).
• 📡 Connect to to someone else's phone via Bluetooth and use it as a modem for calls via instant messengers.
• 💳 Buy virtual SIM (for example, Airalo or Holafly) for temporary access to the network.

If you urgently need to contact a subscriber, but calls do not go through, send an SMS asking them to call you back via messenger. Often SMS are sent even when voice communication is blocked.

FAQ: Frequently asked questions about problems with calls on Android

1. Download the firmware from samfw.com
2. Use Odin for firmware in the mode Download Mode (Vol Down + Power + Home).
3. Select files BL, AP, CP, CSC (not Home CSC!) data-i="329">For other brands, the instructions are different.