Why SMS do not arrive on Android: a complete analysis of the reasons and solutions

Have you sent an important message, but the recipient has not received it? Or did you not receive an SMS with a confirmation code, although the sender claims that he sent everything? The problem with SMS not being received on Androiddevices is more common than it seems - and there are dozens of reasons for it: from a banal lack of memory to hidden operator settings. In this article, we will not just list possible malfunctions, but also show how to diagnose the problem in 5 minutesusing the built-in tools of a smartphone.

The peculiarity of SMS is that they depend on three parties at once: your device, the operator’s network and the sender’s server. If even one link fails, the message is lost without notice. We have collected all the solutions that are relevant for 2026, including little-known ones (for example, a conflict with VoLTE or blocking by IMEI). And for those who don’t like to read, at the end of the article there is an interactive table with quick solutions symptoms.

1. Problems on the operator's side

The first thing you need to check is whether the mobile operator itself is blocking your SMS. This can happen for several reasons:

• 📵 Technical work at the station: operators rarely advertise such events, but they happen 1-2 times a month. Subscribers suffer especially often Tele2 and Yota in the regions.
• 🔒 Blocking on suspicion of spam: if you have recently sent a lot of messages (for example, mailing to clients), the operator could temporarily limit SMS traffic.
• 💳 Unpaid bill: some tariffs (for example, "My conversation" ot MTS) prioritize voice traffic, and SMS is disconnected first in case of debt.

How to check? The most reliable way is to call the operator’s hotline (the numbers are on the official website) and ask about the status of the SMS service for your number. An alternative is to try sending an SMS to another number (not your operator). If the message leaves but does not come back, the problem is definitely on the recipient’s side.

⚠️ Attention: If you use virtual operator (for example, Tinkoff Mobile or SberMobil), check the balance of not only the main account, but also the “connected services”. Some virtual operators block SMS with a zero balance, even on unlimited tariffs.

2. Incorrect SMS center settings

Each SMS passes through SMS center (SMSC) a special operator server that routes messages. If the number of this center is lost or deleted, the messages will go “nowhere”. This problem is especially relevant after:

• 🔄 Changing the SIM card (even if the number remains the same).
• 📱 Transferring a number to another operator (porting).
• 🛠️ Firmware updates or factory resets.

How to check the SMSC number? Enter the combination in the telephone keypad:

##4636##

In the menu that opens, select Phone information → SMSC. If the field is empty or the number does not correspond to your operator, it needs to be updated.

SMS center numbers for popular operators (2026):

Operator	SMSC number
MTS	+79160000000
Beeline	+79030000000
MegaFon	+79260000000
Tele2	+79500000000
Yota	+79990000000

To update SMSC, enter in the telephone keypad:

##767466##

Then select Update or enter the center number manually through the message menu (in old versions of Android).

3. Conflict with VoLTE and Wi-Fi Calling

More than 30% of cases of non-receipt of SMS in 2026-2026 are associated with incorrect operation of VoLTE (voice over 4G) and Wi-Fi Calling technologies. These functions should improve communications, but often break SMS routing. Symptoms:

• 📶 Messages do not arrive when you are connected to Wi-Fi.
• 📞 Calls go through normally, but SMS do not.
• 🔄 After turning off VoLTE in the settings, SMS begin to arrive.

How to check? Open Settings → SIM cards and mobile networks → [your SIM] → Voice communication and disable:

If after this SMS works, the problem is in the operator settings. Contact support with a request to “re-register VoLTE/IMS services” for your number.

⚠️ Attention: On some devices Samsung (series Galaxy A and Galaxy M 2022-2026) there is a bug, due to which, when VoLTE is activated, the ability to send SMS longer than 70 characters is lost. The solution is to update the firmware to version One UI 6.1 or higher.

4. Blocking messages with antispam systems

Modern smartphones aggressively filter SMS to protect users from scammers. But sometimes legitimate messages are also targeted. Where to look for blocking:

• 📱 Built-in Android antispam: open the application Messages → Three dots → Spam and blocking. Check the "Spam" and "Blocked" tabs.
• 🛡️ Third-party antiviruses: Kaspersky, Dr.Web or Avast can block SMS from “suspicious” numbers (for example, short or foreign).
• 🏦 Banking applications: SberBank Online and Tinkoff automatically intercept SMS with codes, but sometimes they also “swallow” regular messages.

How to check? Send yourself a test SMS from another phone. If it did not arrive, but the call history shows that the message was delivered, it means that it is blocked at the device level. Check:

1. Spam folder in the standard messages application.
2. Notification log (an SMS may have arrived, but was not displayed as a notification).
3. Synchronization settings in Google Messages (if you use): sometimes messages get stuck in cloud.

How to disable SMS filtering in Google Messages?

Open the application → Profile → Settings → Spam protection → Disable "Filter spam."

5. Problems with the SIM card or slot

If SMS do not arrive on only one SIM card (in a dual-SIM phone), the problem is most likely:

• 🪪 Physical damage to the SIM: microcracks on the chip or dirty contacts.
• 🔌 Slot malfunctions: oxidation or wear of the spring mechanism.
• 📶 Incompatibility of standards: for example, eSIM may conflict with the physical SIM.

Diagnostics:

1. Try to move the SIM to another slot (if the phone supports Dual SIM).
2. Wipe the contacts of the SIM card with a soft eraser (without pressing!).
3. Check the card in another phone - if you don’t receive SMS there either, the problem is in the SIM or operator account.

What to pay attention to:

• If the phone says "SIM card is not supported" - it may be too old (before 2015) and not compatible with modern networks 5G/VoLTE.
• Some Xiaomi i Realme have a bug when the second SIM stops receiving SMS after updating the firmware. The solution is to reset the network settings (Settings → System → Reset → Reset mobile network).

6. Firmware failures or application conflicts

Software errors are one of the most insidious reasons, because they can appear selectively. For example:

• 🤖 SMS do not come only from certain numbers (most often short or foreign).
• 🔄 Messages arrive with a delay of several hours.
• 📱 After rebooting the phone, several SMS come in batches at once.

What do:

1. Clear the cache of the Messages application: Settings → Applications → Messages → Memory → Clear cache.
2. Disable battery optimization for the messages application (in battery settings).
3. Delete recently installed applications, especially those that requested access to SMS (for example, password managers or fitness trackers).
4. Update firmware up to the latest version. On Samsung this can be done through Smart Switch, on Xiaomi - through MIUI Updater.

If the problem appeared after updating Android, try rolling back to the previous version (instructions are available on forums 4PDA or XDA-Developers). In Android firmware 14 and later there is a bug due to which SMS with Cyrillic characters may arrive in the form of “crazy” or not arrive at all - this can only be treated with a patch from the manufacturer.

7. malfunctions

If none of the previous methods helped, the problem may be in the hardware:

• 📡 Faulty communication module: responsible for signal reception/transmission. It often fails after falls or moisture.
• 🔋 Problems with the antenna: if the phone has poor network reception. (1-2 signal bars), SMS may arrive with a delay or not arrive at all.
• 🖥️ Damage to the motherboard: for example, after unsuccessful repair or overheating.

How to diagnose:

1. Check whether the phone catches the network in Only 2G (Settings → Mobile network → Network typemode. If you receive SMS in 2G, but not in 4G/5G, the problem is in the communication module.
2. See if the phone is heating up in the top area (where the antenna is located). Overheating may indicate a malfunction.
3. Connect the phone to the computer and check the logs via ADB (command adb logcat | grep -i sms). If there are errors like "Radio not available" is a hardware problem.

⚠️ Attention: On phones Samsung Galaxy S22/S23 i Google Pixel 7/8 there is a known problem with the module Exynos 5300, which can “jam” SMS when the signal level is low. If you have one of these models, contact the service center to replace the module under warranty.

Quick diagnostic table

Use this table to determine the cause by symptoms:

Symptom	Probable cause	Solution
SMS does not arrive, but calls work	Conflict with VoLTE or incorrect SMSC	Disable VoLTE, update SMSC
Messages arrive with a delay (hours)	Synchronization with the operator's server failed	Reboot the phone, reset network settings
SMS only from certain numbers do not arrive	Blocking by antispam or operator	Check "Spam" in messages, call operator support
SMS do not arrive on one SIM in a dual-SIM phone	Problem with the slot or SIM card	Clean the contacts, swap the slots
Messages arrive, but are not displayed as notifications	Crash in the Messages application	Clear the application cache, disable battery optimization

FAQ: Frequently asked questions

Can viruses block SMS?

Yes, but extremely rarely. Modern Android viruses more often steal SMS messages (for example, to intercept banking codes) than block them. If you suspect a virus:

1. Install Malwarebytes and scan your phone.
2. Check application permissions in Settings → Applications → Permissions → SMS.
3. If you find a suspicious application, remove it and reset the settings networks.

Why don’t I receive SMS with a confirmation code?

This is a separate category of problems. Most often, codes do not arrive due to:

• 🔄 Overload of the sender's servers (for example, SberBank or Tinkoff during peak hours).
• 📵 Operator blocking of “gray” SMS (many banks send codes from short numbers that operators filter).
• 🛡️ Work of anti-fraud systems (if you often request codes, the service may block their sending).

Solution: try requesting a code via a call (if there is such an option) or use a backup confirmation method (email, push notification).

How to check if my SMS are reaching the recipient?

There are several ways:

1. Delivery report: in the standard Messages application turn on Settings → Advanced → Delivery reports. You will receive notifications whether the SMS has arrived.
2. Test number: send SMS to special services like +79990000000 (u MegaFon) - they will send a response with confirmation.
3. Ask for a return communication: ask the recipient to confirm receipt (but keep in mind that he may not receive your SMS either).

Can IMEI blocking affect SMS?

Yes, but indirectly. If your phone is blocked by IMEI (for example, as lost or stolen), operators can restrict not only calls, but also SMS. You can check the blocking:

1. On the website IMEI.info (enter your IMEI, which can be found by command *#06#).
2. Calling the operator's support and asking about the IMEI status.

If the blocking is confirmed, contact the police (if the phone is yours) or the previous owner (if you bought it second-hand).

What to do if SMS do not arrive on a tablet with a SIM card?

Tablets (for example, Samsung Galaxy Tab or Huawei MatePad) often have problems with SMS due to:

• Lack of SMS support in the firmware (some tablets are designed for data only).
• Conflict with applications for calls (for example, Google Voice).
• Incorrect APN settings (access point).

Solution:

1. Install an alternative application for SMS (for example, Pulse SMS or Textra).
2. Check the APN settings (they must match the settings for your operator's smartphones).
3. If the tablet is on Android 12+, turn on the "LTE Only" mode (Settings → Mobile network → Network type).