Are you waiting for an important message, but it never arrives, although calls are working and the Internet is connected? The problem with SMS delivery on Androiddevices is more common than it seems. The reasons may lie in operator failure, incorrect phone settings, blocking by instant messengers, or even hardware malfunctions. In this article, we will look at why SMS messages do not arrive on your smartphone, and provide troubleshooting tips - from basic checks to deep diagnostics. all possible scenarioswhy SMS messages don’t arrive on your smartphone, and we’ll give you step-by-step guide troubleshooting - from basic checks to in-depth diagnostics.

Feature SMS is that they are transmitted via mobile network (and not the Internet, as in instant messengers), so problems are often related to the settings APN, SIM card or phone firmware. We will not limit ourselves to standard advice like “reboot your phone” - instead we will offer system approachincluding rare reasons (for example, a conflict with Dual SIM or blocking by the operator for spam). If after all the manipulations the messages still do not arrive, you will know for sure whether the phone, SIM card or provider is to blame.

1. Basic diagnostics: what to check first

Before digging deeper, rule out obvious causes. Start by checking network signal: if the status bar displays E (Edge) instead of 4G/LTE, the data transfer speed may not be sufficient for SMS. Also make sure that the problem is not on the sender’s side:

  • 📶 Signal level: if the indicator shows 1-2 bars or is completely absent, move closer to the window or go outside. In basements and elevators, SMS messages often do not reach.
  • 🔄 Airplane mode: even if it is disabled, temporarily turn it on and off (Settings → Network and Internet → Airplane mode). This will reset network connections.
  • 📱 Test SMS: Ask a friend to send you a message from another number. If it arrives, the problem is with the first sender (perhaps his number is on the black list).
  • 💳 SIM card: extract it and check it on another phone. If SMS are received, your device is faulty.

Critical detail: on some models Samsung i Xiaomi s Dual SIM SMS by default comes only to the first SIM card. Check the settings in the section Settings → SIM cards and mobile networks → Default SMS.

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2. Network and APN settings: correcting operator errors

Incorrect parameters access points (APN) is one of the main reasons why SMS do not arrive. Operators periodically update these settings, but the phone does not always pick them up automatically. To fix:

  1. Go to Settings → Mobile network → Access points (APN).
  2. Click on the three dots in the upper right corner and select Reset to defaults.
  3. If this does not help, create a new APN manually. Data for your operator can be found on its official website (for example, for MTS this internet.mts.ru, for Beeline — internet.beeline.ru).

Also check mode network:

  • 📡 3G/4G/5G: in Settings → Mobile network → Network type select LTE/3G/2G (auto). If only 4G, SMS may not go through.
  • 🔄 Roaming: if you are in another country, enable Settings → Mobile network → Roaming data (even for SMS).

Make sure mobile data is enabled|

Reset APN to factory settings|

Check network type (must be LTE/3G/2G)|

Enable roaming if you are border-->

⚠️ Attention: On some firmware (for example, MIUI from Xiaomi) after resetting the APN, the changes will not be applied.

3. SIM card: from cleaning contacts to replacement

Physical damage to the SIM card or its slot is a common cause of problems. Start with a visual inspection:

  • 🔍 Scratches/bends: if there are abrasions on the gold contacts of the SIM card, try gently wiping them with an eraser (without pressing!).
  • 💎 Micro-SIM/nano-SIM: if you are using an adapter for nano-SIM in the slot micro-SIM, check whether it fits tightly. Play may interrupt contact.
  • 🔄 Reinstallation: remove the SIM card, blow out the slot (without saliva!) and insert it back. Sometimes moving it to another slot helps (for Dual SIM).

If the SIM card is old (more than 5 years), its chip could be worn out. Contact your operator for a replacement - it's free. Also check:

  • 📅 Validity period: some operators block SMS on inactive tariffs. Check with your personal account or by number *111# (for MTS/Beeline).
  • 🚫 Blocking: if you often sent spam, the operator could limit SMS. Call support.
Symptom of malfunction Probable cause Solution
SMS does not arrive, but calls work Problems with APN or network settings Reset APN, check the network type
SMS arrives with a delay (hours) Weak signal or operator network overload Move to an area of better coverage
SMS does not arrive from only one number The number is on the black list or blocked by the operator Check the black list, call support
SMS does not arrive on the second SIM card Incorrect settings Dual SIM Assign a default SIM card for SMS

4. Conflicts with instant messengers and applications

Messaging applications (for example, WhatsApp, Viber, Google Messages) can block standard SMS. This happens if:

  • 📥 The application is designated as standard for SMS: check in Settings → Applications → Default icons → SMS application. It should be Messages (or Google Messages).
  • 🚫 Blacklist: some instant messengers (for example Truecaller) have an SMS blocking function. Go to the application settings and check the list of blocked ones.
  • 🔄 Application cache: clear the cache and data for Messages (Settings → Applications → Messages → Memory → Clear cache).

Also delete unused messengers - they may conflict with system services. If the problem appeared after the update Android, try rolling back the update for the application Messages:

  1. Go to Settings → Applications → Messages → Three dots → Uninstall updates.
  2. Reboot your phone.
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If you use Google Messages, check the synchronization settings: Settings → Backup and reset → Data backup. Sometimes disabling this option solves the problem.

5. Resetting settings and updating firmware

If the previous steps did not help, the problem may lie in the system files. Start by resetting network settings (this will not delete your data, but will erase saved Wi-Fi networks and passwords):

  1. Go to Settings → System → Reset → Reset settings Wi-Fi, mobile network and Bluetooth.
  2. Confirm the action and restart the phone.

If this does not work, check firmware updates:

  • 📲 Over the air (OTA) update: Settings → System → System update. Install all available updates.
  • 🔧 Manual firmware: if the phone has not been updated for a long time, download the latest version Android for your model from the manufacturer's official website and flash through Recovery.
⚠️ Attention: On some models Samsung (for example, series Galaxy S20 and newer) after resetting the settings, re-activation is required SIM cards through the menu ##4636## (section Information about the phone).
What to do if after resetting SMS still do not arrive?

If the reset did not help, the problem may be in IMEI phone (for example, after unofficial firmware). Check it through *#06#. If the displayed number is incorrect, recovery is required through the engineering menu or service center. Null or incorrect number, recovery is required through the engineering menu or service center.

6. get by

If none of the software methods worked, the reason may be hardware:

  • 📡 Antenna module: damage after a fall or moisture. Symptom - lack of network even in a good coverage area.
  • 🔌 SIM card slot: oxidation of contacts or mechanical damage. Check if the SIM card is loose in the slot.
  • 🔋 Modem: malfunction of the processor responsible for communication (for example, Qualcomm Snapdragon or Mediatek). It can only be diagnosed at a service center.

You can do the following on your own:

  1. Check the phone for moisture (indicators Liquid Damage Indicator usually located under the SIM card cover).
  2. Connect another device to your SIM card. If SMS are received, the problem is in the phone.

If the phone was packed or reflash unofficially, there is a high risk of loss IMEIIn this case, restoration is possible only through a service center with the original one. cable and software (for example, QCNfile for Qualcomm).

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If the phone does not see the SIM card at all (no network, operators are not detected), the problem is definitely hardware. Don’t waste time on software methods - contact the service.

7. Blocking by the operator: how to check and eliminate

Telecom operators can block SMS for several reasons:

  • 📜 Unpaid bills: with large debts, some operators limit services, including SMS.
  • 🚨 Suspicion of spam: if messages were sent out in bulk from your number, it could block.
  • 🔒 Service activation: for example, Tele2 has the option “Protection from SMS scammers”, which can filter incoming messages.

To clarify:

  1. Call the operator's hotline (numbers: MTS — 0890, Beeline — 0611, MegaFon — 0500, Tele2 — 611).
  2. Use USSD commands: 
    *100# - balance and service status (MTS/Beeline)

    *105# - information about blocking (MegaFon)
    

    *155# - checking restrictions (Tele2)

⚠️ Attention: If the operator has confirmed the block for spam, unblocking may take up to 72 hours. During this period, SMS are received, but do not reach the recipient.

FAQ: Frequently asked questions about problems with SMS on Android

Why do SMS arrive but are not displayed in the application?

This may be due to:

  • A malfunction of the application Messages (try clearing the cache or reinstalling updates).
  • Conflict with other messengers (for example, Google Messages i Samsung Messages may duplicate messages).
  • Notification settings: check if they are disabled in Settings → Notifications → Messages.
Can viruses block SMS?

Yes, some malware (for example, Trojans FakeBank or SmsThief) intercept and block SMS, especially from banks. Check your phone with an antivirus (for example Malwarebytes or Dr.Web) and remove suspicious applications.

What to do if SMS messages arrive, but without text (blank)?

This is a typical problem when:

  • Encoding incompatibility (try sending SMS to Unicode instead of GSM 7-bit).
  • Failure of SMS center operator (check the center number in support).
  • Damage to the application database Messages (resetting its settings will help).
Why don't I receive SMS from banks and services?

Bank SMS (for example, from SberBank or Tinkoff) can be blocked:

  • Operator (if the number is marked as fraudulent).
  • Bank application (for example SberBank Online has its own black list).
  • Settings Do Not Disturb (check exceptions for SMS in Settings → Sound → Not disturb).

Also, some banks send SMS through alternative channels (for example, Push notifications), which can be blocked by energy-saving modes.

How to check if my outgoing SMS are being received?

Send a message to the operator’s short number:

  • MTS: send an empty SMS to 111 —you will receive balance information in response.
  • Beeline: send BALANCE to 102.
  • MegaFon: send 1 to 0500.

If the answer does not come, the problem is on your side. If it arrives, the SMS arrives, but is possibly blocked on the recipient’s side.