Text messages fail for signal, settings, service, or size limits—work through the quick checks below to get sending again.
Why A Text Message Fails To Send
When a text won’t leave your phone, the cause usually sits in one of four buckets: connection, device or app settings, carrier issues, or message content. Start with the easy wins, then move to the deeper fixes.
Quick Checks That Solve Most Send Errors
These basics clear a surprising number of stuck texts and “Not Delivered” alerts on both iPhone and Android.
| Symptom | What It Usually Means | Quick Fix |
|---|---|---|
| No bars or a crossed-out signal icon | No cellular path for SMS/MMS | Move to better coverage or connect to Wi-Fi; try Wi-Fi Calling or RCS/iMessage when available |
| Airplane mode toggled on | Radio is off | Turn it off; wait 10 seconds; retry the message |
| Only one contact fails | Wrong number, blocked contact, or the other phone is offline | Confirm the number, remove leading zeros or extra country code digits, and ask the contact to check blocks |
| Photo or video refuses to send | MMS file exceeds the carrier’s limit | Compress the media or share a link; send over chat features or iMessage when possible |
| “Waiting for activation” or green bubbles where blue are expected | RCS or iMessage isn’t active | Toggle chat features or iMessage off and on, then wait up to 24 hours |
| Old SIM or recent number change | Carrier profile or SMSC settings need refresh | Power cycle, reseat the SIM, or contact the carrier for reprovisioning |
Step-By-Step Fixes On iPhone
Confirm Network And Service
Check the signal indicator, then send a short plain text to a different contact. If both fail, switch to Wi-Fi and enable Wi-Fi Calling if your plan supports it. You can also check Apple’s service status to rule out a broader issue with iMessage.
Reset Message Paths Cleanly
Go to Settings > Messages. Toggle iMessage off, wait 10 seconds, and turn it back on. Open Send & Receive and confirm your phone number has a checkmark. If activation is pending, leave the phone on a network and try again later.
Mind MMS And Group Settings
In Settings > Messages, make sure MMS Messaging and Group Messaging are on. Many carriers gate these features, so a plan change or a SIM swap can quietly disable them. If a photo still won’t go, compress it in Photos or send a shared album link.
When There’s No Signal At All
With iPhone 14 or later, you can use Messages via satellite where supported. Step outside with a clear view of the sky; your phone guides you to connect. Texts may send slower and attachments are limited, but it keeps basic communication alive when towers are out of reach.
Step-By-Step Fixes On Android
Rule Out Connectivity First
Send a plain text to a second contact. If nothing leaves the phone, toggle Airplane Mode on and off, then try Wi-Fi and mobile data separately. If your device supports RCS chat features, open Messages settings and confirm chat is “Connected.” See Google’s steps to get chat working.
Refresh The Messages App
In Settings > Apps > Messages, force stop, then clear cache. Reopen Messages and send again. If problems persist, clear storage (this resets preferences, not your texts on many devices, but back up first). Update both Messages and Carrier Services in the Play Store.
Check SMSC And Default SIM Routes
Dual-SIM phones can point texts at the wrong line. In the Messages compose screen, pick the correct SIM. If outbound SMS fails system-wide, your carrier may need to refresh the SMS center number on your line; contact support from another phone or web chat.
Media Sending Fails?
That’s usually an MMS size ceiling. Many networks cap images near 300–600 KB between carriers, while in-network apps may allow more; one U.S. carrier lists about 3.5 MB for certain routes (details). Shrink the file or switch to RCS chat features over data where both sides support it.
Sender, Recipient, Or Content Problems
Numbers, Blocks, And Short Codes
A single contact failing often points to an error in the stored number, a block on either side, or a short code that the carrier has restricted. Re-enter the contact by hand. Ask the recipient to text you first to refresh the route. For short codes, some plans require enabling paid SMS.
Group Threads That Split
If a group thread breaks into separate one-to-one texts, someone in the thread lacks data service, iMessage or RCS is inactive, or MMS group messaging is off. Keep the group alive by sending plain text until everyone’s data connection and settings are back.
International And Roaming Rules
Travel often changes default routes. Enable data roaming if you expect to use RCS or iMessage abroad. For SMS and MMS, confirm your plan supports international messaging and your device is set to the correct network bands in Mobile Networks.
Carrier, Outage, And Plan Issues
Outages And Maintenance Windows
Widespread failures can stem from service outages or carrier maintenance. If both SMS and data flake out across many contacts, check a status page for your device’s services and your carrier’s support feed. If a planned window is active, messages may queue and send later.
Account, Billing, And Provisioning
Late bills, plan downgrades, and expired add-ons can strip MMS or international messaging. Log in to your carrier account and confirm nothing changed. Ask the carrier to “reprovision” your line, refresh the IMEI on file, and push the latest carrier settings.
Make Large Messages Send Reliably
Big photos and long videos are the top reason MMS stalls. Trim clips to under a minute and lower camera resolution before sending. When quality matters, share a cloud link instead of pushing the full file through MMS.
| Limit Or Requirement | Typical Value | Where To Change Or Check |
|---|---|---|
| MMS size | About 300–600 KB across carriers; some allow ~3.5 MB in-network | Camera settings, video trim tools, or carrier app |
| iMessage or RCS activation | Can take up to 24 hours | iPhone Settings > Messages; Android Messages > Chat features |
| Group MMS toggle | Must be on to keep a single thread with mixed phones | iPhone Settings > Messages; Android Messages settings |
When To Suspect Hardware
SIM, Antenna, Or Storage Issues
If calls drop, signal bars swing wildly, or the phone only works when pressed against a window, a hardware fault may be in play. Test your SIM in another phone and try a known-good SIM in yours. Clear local storage if the device is full; some phones halt MMS downloads until space opens up.
Factory Reset As A Last Resort
Back up the phone, remove screen locks you might forget, and reset from system settings. Set up as new, test messaging, then restore only the apps you trust. If texting works on a clean build but breaks after restoring, an app or old setting was the culprit.
Prevent The Next “Not Delivered”
Keep Both Paths Ready
Leave SMS/MMS on alongside iMessage or chat features so messages fall back when data stalls. Keep the OS and the Messages app current. Turn Wi-Fi Calling on when your carrier supports it.
Know The Status Pages That Matter
When messaging misbehaves, a quick glance at official status pages can save a lot of guesswork. Bookmark your device maker’s service dashboard and your carrier’s alert channel.
A Simple Troubleshooting Flow You Can Follow
Work top-down to save time. First, send a plain text to a second contact. If that fails, power the phone off for 30 seconds, then on. Next, toggle Airplane Mode on, wait 10 seconds, then off. If errors remain, test on Wi-Fi with mobile data off. Now open your messaging app and refresh it: on Android, force stop and clear cache; on iPhone, toggle iMessage off and on. Reboot again. Try a tiny text, then a small photo. Only after these steps call the carrier for a line refresh and the latest carrier settings.
Special Cases That Trip People Up
Switching Phones Or Platforms
Moving between iPhone and Android can strand messages in the wrong lane. If you left iPhone, deregister the Apple service tied to your number and give routes time to clear. If you returned to iPhone, enable iMessage, confirm the checkmark beside your number, and wait for activation before testing group threads.
RCS, SMS, And MMS Behave Differently
RCS rides on data with chat features and larger media. SMS is plain text with tiny payloads. MMS carries media but hits strict size limits. When a photo won’t go, a size cap is the usual cause; some networks list about 3.5 MB in-network while cross-carrier paths sit near a few hundred kilobytes. Shrink the file or send a link when quality matters.
Numbers, Short Codes, And Parental Controls
Extra digits, leading zeros, or saved formatting can break delivery. Re-enter the number using + and a single country code, then test. Short codes may be blocked on some plans. Kids’ phones can also filter unknown senders or paid texts; review device restrictions and any carrier-level content filters.
Know When To Escalate
If texts fail across every app, calls sound rough, and data crawls in places that used to be fine, gather screenshots and times. Reach carrier tech support, request line reprovisioning, and try a new eSIM or SIM.