If your texts won't send, show as delivered, or stop arriving, the problem is usually signal strength, settings, storage, or a carrier issue. The fix depends on whether you use iMessage, SMS, or RCS, and whether the failure affects one contact or every message.
Quick Checks That Fix Most Cases
Before changing settings, rule out the obvious:
- Check signal bars and whether Airplane Mode is on.
- Ask the other person if their messages are failing too.
- Check if you're blocked: an iMessage stays blue but never delivers; an SMS shows "Sent" but no reply comes back.
- Verify you have enough storage—full phones often block new messages.
- Check the date and time. Wrong settings can prevent messages from connecting to servers.
What "Delivered," "Failed," and "Not Delivered" Mean
On iPhone, a blue bubble means iMessage; green means SMS. If you see "Not Delivered," tap it to try sending again as a text message. On Android, a slash through the arrow means the message wasn't sent. These indicators help you decide whether the issue is with Apple's servers, your carrier, or the other person's phone.
iPhone: Messages Stuck or Not Sending
- Toggle iMessage. Go to Settings > Messages and turn iMessage off, wait 30 seconds, then turn it back on. If messages are green bubbles and failing, this often resets the handshake between your phone and Apple's servers.
- Check for a carrier update. Go to Settings > General > About. If an update is available, you'll see a prompt here.
- Check date and time. Go to Settings > General > Date & Time and make sure Set Automatically is on. Incorrect time breaks server connections.
- Reset network settings. Go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings. Keep your Apple ID password handy because you may need to sign back in, and have your Wi-Fi passwords ready since this clears saved networks.
- Check storage. Go to Settings > General > iPhone Storage. If available space is under 1 GB, delete apps or photos before expecting messages to work.
- Check Low Data Mode. Go to Settings > Cellular > Cellular Data Options. If Low Data Mode is on, turn it off temporarily—iMessage can stall behind it.
- Check for iOS updates. Go to Settings > General > Software Update and install any available update.
Android: Messages Not Sending or Receiving
- Check the default SMS app. Go to Settings > Apps > Default Apps > SMS. If a third-party app is selected, switch to your carrier app or Google Messages.
- Clear the Messages app cache. Go to Settings > Apps > Messages > Storage > Clear Cache. Do not clear Data unless messages are vanishing, because that deletes conversations.
- Check SMS permission. Go to Settings > Apps > Messages > Permissions and make sure SMS is allowed.
- Check RCS settings. In Google Messages, tap your profile picture > Messages settings > RCS. Turn it off if texts fail, then on again.
- Check storage. Go to Settings > Storage. Phones under 10% free often throttle messaging.
- Safe mode test. Restart in Safe Mode. If messages work there, a downloaded app is interfering.
- Check for app updates. Open the Play Store, search for Messages, and update if available.
Both Platforms: Common Causes
- Carrier outages or bill issues. If all texts fail, contact your carrier. Account suspensions or tower maintenance often cause this.
- Number porting or SIM issues. If you recently switched carriers, the SIM may not be fully activated. Remove and reseat it, or visit a store.
- Do Not Disturb or Focus mode. This silences alerts but usually doesn't block sending. Check Settings > Focus or Do Not Disturb.
- Blocked or filtered contacts. On iPhone, check Settings > Messages > Blocked Contacts. On Android, open the conversation > Details > Block.
Important Warnings
- Resetting network settings erases saved Wi-Fi passwords and Bluetooth pairings.
- Clearing Messages data deletes your conversation history.
- Do not install third-party "fixer" apps—they often harvest data and rarely solve the problem.
If Nothing Works
If texts still fail after these steps, back up your messages, then update iOS or Android. If the problem started after an update, wait for the next patch or contact manufacturer support. For one-way failures—messages send but replies never arrive—the other person's carrier or phone is usually the cause, not yours.
When to Contact Support
Reach out to your carrier if you see "No Service," "SOS Only," or if calls are also dropping. For iPhone, Apple Support can check iMessage activation. For Android, your device manufacturer handles hardware or OS issues. Keep your account number and device IMEI ready to speed up the process.
Start with the steps for your device. If one fix doesn't work, move to the next. Most text failures clear up after a settings toggle or carrier check. If you're unsure which step to try first, begin with the quick checks—that's where the majority of problems are solved.