Android Not Sending SMS – 8 Proven Fixes (2026)

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Android not sending SMS is a frustrating issue that prevents you from communicating with friends, family, and colleagues. When Android not sending SMS occurs, you may see a red exclamation mark, a stuck “Sending” status, or messages that fail to go through even with a strong signal[reference:0]. This guide covers every possible cause and provides clear steps to resolve Android not sending SMS quickly.

For more Android troubleshooting guides, visit our Android Troubleshooting Hub. You can also check our guide on app crashing issues for additional help.

For additional assistance, refer to Google Messages official support and check your carrier’s status at DownDetector to see if there is a known network outage.

Featured Snippet: To resolve Android not sending SMS, start by toggling Airplane Mode on and off for 30 seconds to refresh your network connection. If that does not work, clear the Messages app cache, verify your default messaging app, or check your SMS Center (SMSC) number. For persistent Android not sending SMS issues, try restarting your phone, updating the app, or resetting network settings.

Why This Messaging Problem Occurs

This is a common frustration that can stem from various sources. SMS, MMS, and RCS chats rely on different parts of your phone’s network setup, so a single misconfiguration or connection hiccup can break sending even when everything else seems fine[reference:1].

Here are the most common reasons why Android not sending SMS happens:

  • Weak or Unstable Signal: Even if calls work, a weak cellular signal can block outgoing SMS. Moving to an area with better reception often resolves the issue[reference:2].
  • Incorrect Default Messaging App: If another app is set as default, messages may fail to send through Google Messages or Samsung Messages[reference:3].
  • Corrupted App Cache: Temporary files in the Messages app can become corrupted and interfere with sending[reference:4].
  • Incorrect SMS Center (SMSC) Number: A mismatch between your SIM card and the SMSC number can make SMS communication impossible[reference:5].
  • SIM Card Issues: An improperly inserted or unrecognized SIM card prevents connection to the cellular network[reference:6].
  • Outdated App or System: An outdated version of Google Messages or Android can cause compatibility issues[reference:7].
  • RCS Misconfiguration: RCS chat features can block messages if the connection fails or the phone number is incorrect[reference:8].
  • Carrier or Network Problems: Carrier outages, account limits, or network restrictions can prevent SMS from sending[reference:9].

💡 Quick Tip: Start by toggling Airplane Mode on and off—this resolves Android not sending SMS for many users.

Method 1: Check Signal and Toggle Airplane Mode

Weak or unstable cellular signal is the most common reason SMS fails to send. Even when calls seem fine, your phone may be clinging to a congested tower or a fading signal that blocks outgoing messages[reference:10]. Toggling Airplane Mode forces a full disconnect and reconnection, often fixing the issue in seconds[reference:11].

  1. Look at your signal bars and try moving near a window or stepping outside if you are indoors.
  2. Turn on Airplane Mode from Quick Settings (swipe down from the top).
  3. Wait about 30 seconds.
  4. Turn Airplane Mode off so the phone re-registers with the nearest tower[reference:12].
  5. If Wi-Fi is on, briefly turn it off as well to ensure messages attempt to send over mobile signal.
  6. Try sending your SMS again.

✅ Expected Result: Messages that were stuck should send immediately, and new texts should go through without error icons[reference:13].

💡 Common Mistake: Many users forget to wait the full 30 seconds. Give the network time to fully disconnect before reconnecting.

Method 2: Set the Correct Default Messaging App

If Android not sending SMS persists, you may have the wrong app set as your default messaging app. Android phones allow you to choose which app handles SMS, and using the wrong one can break sending[reference:14].

  1. Open Settings on your Android phone.
  2. Tap Apps > Default apps.
  3. Tap SMS app (or “Messaging app”).
  4. Select Google Messages (or Samsung Messages on Samsung devices)[reference:15].
  5. If Google Messages is not installed, download it from the Google Play Store[reference:16].
  6. Try sending your SMS again.

✅ Expected Result: After setting the correct default app, Android not sending SMS resolves and messages send normally[reference:17].

⚠️ Additional Note: If you previously installed a third-party messaging app, it may have taken over as default without you realizing it.

Method 3: Clear Messages App Cache and Data

Corrupted cache data is a frequent trigger for messaging failures[reference:18]. Clearing the cache often resolves the issue without affecting your messages.

  1. Go to Settings > Apps (or Apps & notifications).
  2. Tap See all apps and find Messages (Google Messages) or Samsung Messages.
  3. Tap Storage & cache (or Storage).
  4. Tap Clear Cache first[reference:19].
  5. If the issue persists, tap Clear Data (this will reset the app but not delete your messages).
  6. Restart the Messages app and try sending again.

✅ Expected Result: After clearing cache, the Android not sending SMS issue resolves and messages send without errors.

⚠️ Important Warning: Clearing data will reset app settings but will not delete your text messages. Your messages are stored separately.

Method 4: Verify SMS Center (SMSC) Number

An incorrect SMS Center (SMSC) number can make SMS communication impossible[reference:20]. This number is provided by your carrier and must match your SIM card.

  1. Open your phone’s dialer app.
  2. Dial *#*#4636#*#* (this code may vary depending on your phone model and carrier)[reference:21].
  3. Select Phone information (or a similar option).
  4. Scroll to the SMSC field[reference:22].
  5. Tap Refresh to update the number automatically.
  6. If the field is blank or incorrect, enter your carrier’s SMSC number (contact your carrier for the correct number).
  7. Tap Update and restart your phone[reference:23].

✅ Expected Result: After verifying or updating the SMSC number, Android not sending SMS resolves.

⚠️ Important Warning: The *#*#4636#*#* code is a hidden testing menu. Only change the SMSC number if you are certain of the correct value. Contact your carrier if unsure.

Method 5: Restart Your Phone and Reseat the SIM

A simple restart can clear minor glitches, and reseating the SIM card ensures proper network connection. SIM card issues can prevent your phone from connecting to the cellular network[reference:24].

  1. Turn off your phone completely.
  2. Remove the SIM card from your phone[reference:25].
  3. Check the SIM card for any visible damage or dirt.
  4. Reinsert the SIM card, ensuring it is aligned correctly.
  5. Turn your phone back on[reference:26].
  6. Try sending your SMS again.

✅ Expected Result: After restarting and reseating the SIM, Android not sending SMS resolves and messages send normally.

💡 What Happens Next: If the SIM card appears damaged, contact your carrier for a replacement.

Method 6: Update the Messages App and System

An outdated Google Messages app can cause compatibility issues that prevent you from sending text messages[reference:27]. Updating the app and your system often resolves the problem.

  1. Open the Google Play Store.
  2. Search for Google Messages.
  3. Tap Update to install the latest version[reference:28].
  4. If you are using Samsung Messages, check for updates in the Galaxy Store.
  5. Also check for system updates: go to Settings > System > System Update.
  6. Restart your phone after updating.

✅ Expected Result: After updating, Android not sending SMS resolves and messages send without errors.

Method 7: Check RCS Settings and Carrier Support

RCS (Rich Communication Services) can sometimes interfere with traditional SMS. If RCS is misconfigured, messages may fail or hang, especially when texting other Android users[reference:29]. Additionally, not all carriers support SMS, MMS, or RCS messaging[reference:30].

  1. Open Google Messages.
  2. Tap your profile picture > Messages settings > RCS chats.
  3. Check the status—it should say “Connected”[reference:31].
  4. If it says “Disconnected” or “Stuck verifying,” toggle RCS off, wait a few seconds, then turn it back on[reference:32].
  5. If RCS continues to cause problems, leave it off temporarily and try sending as SMS[reference:33].
  6. Verify that your carrier supports SMS messaging on your plan.

✅ Expected Result: After adjusting RCS settings, Android not sending SMS resolves and messages send correctly.

⚠️ Additional Note: If you recently switched carriers or phones, RCS may need to be re-verified with your phone number.

Method 8: Reset Network Settings

If none of the above methods resolve Android not sending SMS, resetting network settings can fix underlying connectivity issues[reference:34].

  1. Go to Settings > System > Reset options (or General Management on Samsung).
  2. Tap Reset Wi-Fi, mobile & Bluetooth (or “Reset network settings”).
  3. Confirm the reset.
  4. Your phone will restart, and network settings will return to default.
  5. Reconnect to your mobile network and try sending an SMS.

✅ Expected Result: After resetting network settings, Android not sending SMS resolves and messages send normally.

⚠️ Note: Resetting network settings will remove saved Wi-Fi passwords and Bluetooth pairings. You will need to reconnect to Wi-Fi networks afterward.

Conclusion: Resolving This Messaging Issue

When Android not sending SMS occurs, start by toggling Airplane Mode and checking your signal strength. Most cases of Android not sending SMS resolve quickly by clearing the Messages app cache, setting the correct default messaging app, or restarting your phone. If Android not sending SMS persists, try verifying your SMSC number, updating the app, checking RCS settings, or resetting network settings. The issue is often temporary and can be resolved with the right troubleshooting steps.

Frequently Asked Questions

What causes Android not sending SMS?

Android not sending SMS is typically caused by weak signal, incorrect default messaging app, corrupted app cache, incorrect SMSC number, SIM card issues, outdated app, RCS misconfiguration, or carrier problems.

How do I fix Android not sending SMS on Samsung?

To fix Android not sending SMS on Samsung, toggle Airplane Mode, clear Samsung Messages cache, set Samsung Messages as default, or check the SMSC number. If the issue persists, update the app or reset network settings.

Does clearing cache fix Android not sending SMS?

Yes. Clearing the Messages app cache is one of the most effective fixes for Android not sending SMS, as corrupted temporary files are a common cause[reference:35].

What is the SMSC number and why does it matter?

The SMSC (SMS Center) number is a carrier-specific number that routes your text messages. If it is incorrect or missing, Android not sending SMS can occur. You can check it using the *#*#4636#*#* dialer code[reference:36].

Can a VPN cause Android not sending SMS?

Rarely. VPNs typically affect internet traffic, not SMS. However, if you are using Wi-Fi calling or RCS over Wi-Fi, a VPN could interfere. Try disabling your VPN to see if it resolves Android not sending SMS.

How do I reset network settings on Android?

Go to Settings > System > Reset options > Reset Wi-Fi, mobile & Bluetooth. This can resolve Android not sending SMS caused by network configuration issues[reference:37].

Why can I receive texts but not send them?

This is a common symptom of Android not sending SMS. It often indicates a problem with outgoing SMS settings, such as an incorrect SMSC number, a misconfigured default messaging app, or a carrier-side restriction[reference:38].

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