When an Android phone cannot send text messages, the problem usually sits in one of five places:
- the carrier or SIM;
- the default messaging app;
- SMS/MMS settings;
- RCS;
- one specific contact or conversation.
The quickest way to fix it is to identify which type of message is failing before resetting network settings or changing APN values.
First, Check Whether Calls and Mobile Data Still Work
Send a test text, then check two other things:
- Can you make a normal phone call?
- Does mobile data work with Wi-Fi turned off?
If calls, mobile data, and text messages are all failing, the problem is probably broader than the Messages app.
Check:
- signal strength;
- Airplane mode;
- carrier outage;
- account or billing status;
- SIM or eSIM activation.
If Android is not detecting the SIM correctly, use SIM Card Not Detected on Android before continuing.
If mobile data is also failing, see Mobile Data Not Working on Android.
Check Whether SMS, MMS, or RCS Is Failing
Modern Android messaging can use several different technologies.
SMS is the standard text-message system.
MMS is commonly used for pictures, videos, and some group messages.
RCS uses mobile data or Wi-Fi and adds features such as read receipts, typing indicators, high-quality media, and richer group chats.
Google currently supports RCS between Android phones and compatible iPhones as well.
Knowing which one is failing matters.
If plain text messages fail
Focus on:
- signal;
- SIM;
- carrier account;
- default SMS app.
If only pictures or group messages fail
Focus on:
- mobile data;
- MMS;
- APN settings;
- carrier support.
If only RCS chats fail
Focus on:
- internet connection;
- Google Messages;
- RCS status;
- automatic SMS/MMS fallback.
Make Sure Google Messages Is the Default SMS App
Only one Android app can normally act as the default SMS app at a time.
Google currently recommends confirming that Google Messages is set as the default when SMS or RCS messages will not send.
Open:
Settings > Apps > Default apps > SMS app
Then select:
Google Messages
Menu names vary slightly by manufacturer.
If you recently switched messaging apps, setting the correct default can resolve sending failures immediately.
On newer Samsung Galaxy phones, Google Messages is also the safer app to troubleshoot around because Samsung has been moving newer devices away from Samsung Messages.
Restart the Phone
A restart can re-register the phone with the carrier network and reload messaging services.
Restart Android normally, wait for signal to return, then send a short plain-text message.
Do this before clearing app data or resetting network settings.
Toggle Airplane Mode
Airplane mode can force Android to reconnect to the mobile network.
- Turn Airplane mode on.
- Wait about 10 seconds.
- Turn it off.
- Wait for the carrier name and signal bars to return.
- Send another message.
If the phone does not reconnect to the carrier afterward, investigate the SIM, signal, or account rather than the Messages app.
Check Your Mobile Plan or Account
SMS can fail even when the phone itself is working normally.
Google recommends checking that:
- the account is active;
- you have enough credit or messaging allowance;
- the carrier supports the message type you are trying to send.
Carrier-side causes include:
- unpaid balance;
- suspended service;
- expired prepaid credit;
- SMS restrictions;
- provisioning errors;
- service outage.
If every outgoing SMS fails despite strong signal, ask the carrier to confirm that outgoing SMS is provisioned correctly on the line.
If Only One Contact Will Not Receive Your Messages
Do not reset the whole phone when every other conversation works.
Check the affected contact.
Confirm:
- the number is correct;
- the country code is correct where required;
- the contact is not blocked;
- the conversation is using the intended number if the person has several.
Google specifically recommends deleting and recreating the contact when a sending problem affects only one person.
Also check whether the recipient recently changed phones, carriers, or messaging services.
If You Recently Switched From iPhone
An old iMessage registration can cause messaging problems after moving a phone number from iPhone to Android.
Apple may still associate the number with iMessage.
Deactivate iMessage for that number if you no longer use it on an iPhone.
Google specifically recommends checking iMessage registration when text problems begin after switching from an iPhone.
This is especially relevant when messages involving iPhone users behave differently from messages to Android users.
Check Google Messages for Updates
Open Google Play Store and update Google Messages if an update is available.
Google includes running the current Messages version among its primary troubleshooting steps.
After updating:
- Restart the phone.
- Open Google Messages.
- Send a short SMS test.
If the problem began after a wider Android update and several apps are also malfunctioning, see Apps Keep Crashing After Android Update.
Check RCS Status Separately
If SMS works but an RCS chat does not, do not troubleshoot the carrier SMS service as though everything is broken.
In Google Messages:
Profile picture > Messages settings > RCS chats
Check the status.
Google may show states such as:
- Connected;
- Connecting;
- Not supported;
- Disabled by carrier.
If RCS is stuck:
- Confirm mobile data or Wi-Fi works.
- Update Google Messages.
- Confirm Google Messages is the default SMS app.
- Check the RCS status again.
Google notes that RCS availability still varies by carrier and region.
Turn On Automatic SMS/MMS Fallback for RCS
RCS can fail temporarily when the recipient loses RCS access or your own connection is unstable.
Google Messages includes an option to fall back to standard messaging.
Open:
Google Messages > Profile picture > Messages settings > RCS chats
Look for:
Automatically resend as text (SMS/MMS)
Enable it if you want failed RCS messages to retry through SMS or MMS when possible.
Carrier charges can still apply to SMS or MMS.
If Pictures or Group Messages Will Not Send
When plain SMS works but photos, videos, or group messages fail, focus on MMS or RCS.
For traditional MMS, Google recommends making sure the phone has a working mobile-data connection.
Turn off Wi-Fi temporarily and test mobile data.
If mobile data does not work, MMS may fail even though normal SMS still sends.
Also check:
- attachment size;
- carrier MMS support;
- APN settings;
- group messaging mode.
Do not keep clearing the Messages cache if the real problem is mobile data.
Reset APN Settings Only for MMS or Mobile-Data Problems
APN settings control how Android connects to carrier data services.
Incorrect APN settings can interfere with MMS.
Google recommends resetting APN settings to default when MMS will not send.
The path varies, but it is usually under:
Settings > Network & internet > SIMs > Access Point Names
or a manufacturer equivalent.
Use:
Reset to default
rather than entering random APN values found online.
Carrier APN settings are network-specific.
If you need custom APN values, get them directly from your carrier.
Do Not Change the SMS Message Center Number Without Evidence
Older troubleshooting guides often recommend editing the SMSC or Message Center number early.
I would not do that.
The message-center number is carrier-controlled and is normally provisioned automatically.
If outgoing SMS consistently fails while calls and other carrier services work, ask the carrier to verify SMS provisioning and the correct SMSC value.
Do not replace it with a number copied from an unrelated network or website.
Clear Google Messages Cache Only if the App Is Misbehaving
Cache clearing is useful when the Messages app itself:
- freezes;
- crashes;
- refuses to open;
- displays stale interface behavior.
Open:
Settings > Apps > Google Messages > Storage & cache > Clear cache
This does not normally delete your message history.
Do not use Clear storage as an early fix.
Clearing app storage resets the app and its preferences and should be reserved for situations where simpler app troubleshooting has failed.
For more detail, see How to Clear Cache on Android Without Losing Data.
Check for Android and Google Play System Updates
Messaging relies on more than the Messages app.
Install available:
- Android system updates;
- Google Play system updates;
- carrier-related updates where offered.
Restart afterward.
This is especially important when SMS or RCS problems begin immediately after a major Android upgrade.
Dual-SIM Phones: Check the Sending SIM
A dual-SIM phone can use different lines for calls, mobile data, and SMS.
Before sending, check which SIM Google Messages is using.
If one line has no service, no credit, or no SMS provision, messages can fail even though the other SIM works normally.
Test the same message from the other SIM if possible.
If only one SIM fails across multiple phones, contact that carrier.
Why Short-Code Messages May Fail
Some banks, services, and businesses use short-code numbers.
Google notes that some short codes are outbound-only and cannot receive replies.
Android can also restrict Premium SMS permissions because some premium messages may incur charges.
If ordinary contacts work but one short code does not, do not treat that as a general SMS failure.
Check whether:
- the short code accepts replies;
- Premium SMS access is permitted;
- the carrier supports that short code.
Test the SIM in Another Phone
This is one of the strongest tests when every SMS fails.
Put the SIM in another compatible phone, if practical.
Then send a plain text message.
If SMS also fails in the second phone
The likely causes are:
- SIM problem;
- carrier account;
- network provisioning;
- outage.
Contact the carrier.
If SMS works in the second phone
The original Android phone or its software is more likely to be responsible.
That is a better reason to investigate device settings than repeatedly calling the carrier.
Reset Mobile Network Settings Only After the Targeted Checks
A network reset can help when Android’s cellular configuration is corrupted, but it should come late.
Depending on the phone, look under:
Settings > System > Reset options
or:
Settings > General management > Reset
Choose the mobile-network or network-settings reset offered by your device.
Read the warning carefully.
Depending on the manufacturer, it may reset:
- mobile network preferences;
- Wi-Fi networks;
- Bluetooth pairings.
If your saved Wi-Fi credentials matter, check How to Find Saved WiFi Passwords on Android before performing a broader network reset.
When You Should Contact the Carrier
Contact your carrier when:
- every outgoing SMS fails;
- the SIM also fails in another phone;
- calls or mobile service are restricted;
- the account may be suspended;
- SMS works on one SIM but not another;
- the carrier recently replaced or reprovisioned the SIM;
- outgoing SMS provisioning needs to be checked;
- MMS still fails after restoring the correct APN.
Tell the carrier exactly what works.
For example:
Calls and mobile data work, but outgoing SMS fails to every number.
That is more useful than saying only that “texting is broken.”
If You Can Send but Cannot Receive Messages
That is a different problem.
Outgoing and incoming SMS can fail for different reasons.
If your messages send normally but incoming texts never arrive, use Not Receiving Text Messages on Android instead.
Keeping those two problems separate prevents unnecessary changes to settings that are already working.
