How to Fix Galaxy S26 Text Messages Not Sending After Update

Galaxy S26 Text Messages Not Sending After Update usually means the phone lost mobile network registration, the default messages app is misconfigured, or the update broke SMS and MMS settings.

For related help, also see How to Fix Galaxy S26 Mobile Data Not Working After Update, How to Fix Galaxy S26 Notifications Not Working After Update, How to Fix Galaxy S26 Gmail App Not Syncing After Update, and the Galaxy S26 hub.

Fix #1: Check signal and restart the phone

SMS cannot send normally if the phone is not fully connected to the carrier.

1. Make sure the Galaxy S26 has working cellular signal.
2. Restart the phone.
3. Try sending a plain SMS to one contact.

Fix #2: Confirm the correct default messages app

Switching apps during or after the update can break texting behavior.

1. Open Settings > Apps > Choose default apps.
2. Check that your preferred Messages app is selected.
3. Open that app and retry the message.

Fix #3: Clear the Messages app cache

Corrupted cache can stop SMS or MMS from sending.

1. Go to Settings > Apps > Messages > Storage.
2. Tap Clear cache.
3. Reopen Messages and send again.

Fix #4: Reset network settings

This is one of the best fixes when texting fails after an update.

1. Open Settings > General management > Reset.
2. Tap Reset network settings.
3. Restart the phone and test SMS and MMS again.

If text messages still will not send on the Galaxy S26, contact your carrier to check SMS provisioning on the line. If only RCS is failing, temporarily turn off RCS and test standard SMS first.