Symptoms
- Message shows a red exclamation point or 'not delivered'
- Text stays stuck on sending indefinitely
- Works for some contacts but not others
- Green versus blue bubble confusion on iPhone
Likely causes
- CommonWeak or no cellular signalTexts need at least a basic cellular or data connection to send.
- CommoniMessage or RCS trying and failing to connectWhen these internet-based messaging systems can't connect, messages can get stuck instead of falling back to SMS automatically.
- PossibleRecipient blocked or on a blocked listA blocked contact's texts won't send or receive without any error shown to you.
- PossibleMessage app cache or software glitchA temporary bug in the messaging app can prevent proper delivery.
- Less commonCarrier account issue with texting specificallyA billing problem could disable texting while calls and data still work.
What to do
- Check cellular signal strength and try moving to a better coverage area.
- For iPhone, go to Settings > Messages and toggle iMessage off and back on.
- Confirm the recipient isn't blocked by checking your blocked contacts list.
- Restart the phone to refresh its network and messaging connection.
- Try sending as a plain SMS instead of iMessage/RCS if the option is available (long-press the message and choose 'Send as Text Message').
- Check for a carrier settings or software update.
- Test sending to a different contact to see if the issue is contact-specific.
- If texts fail to send to everyone even with good signal, contact your carrier to check texting on your account.
When to call a pro
If texts fail to send to all contacts despite good signal and troubleshooting, contact your carrier to check the texting service on your account.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.