Fix SMS Text Galaxy S7: 9 Working Solutions

If your Samsung Galaxy S7 won’t send or receive SMS text messages, the fix usually involves clearing the messaging app’s cache, checking your message center number, or resetting network settings. This article walks through the most common causes and provides step-by-step solutions to get your texting working again.

Why SMS Fails on the Galaxy S7

SMS (Short Message Service) relies on your carrier’s cellular network, not your internet connection. When texts fail on the S7, the problem is often one of these:

• App cache corruption: The default Messages app stores temporary data that can become corrupted, causing it to crash or freeze.
• Incorrect message center number: Your phone needs the right SMS center number from your carrier to route messages.
• Network registration issues: The phone may lose its connection to the carrier’s tower, especially after a software update or when traveling.
• Blocked numbers: You might have accidentally blocked the person you’re trying to text.
• SIM card problems: A loose, dirty, or damaged SIM can prevent SMS entirely.

The fixes below address each of these, starting with the safest and most common.

1. Restart and Check Basic Settings

A simple restart clears temporary glitches and re-registers your phone with the network. Press and hold the power button, then tap Restart. After it boots, try sending a text.

If that doesn’t work, check:

• Airplane mode: Swipe down from the top and make sure the airplane icon is gray (off).
• Mobile data: SMS doesn’t need data, but some carriers route texts over LTE; ensure mobile data is on.
• Signal strength: Look at the signal bars. If they’re low, move to a window or go outside.

2. Clear the Messages App Cache and Data

The most effective fix for a stuck messaging app is clearing its cache. This removes corrupted temporary files without deleting your conversations.

1. Go to Settings > Apps (or Applications).
2. Tap Messages (the default Samsung app).
3. Tap Storage.
4. Tap Clear cache. (Do not tap “Clear data” yet, as that will erase your text history.)
5. Restart your phone and try texting.

If the problem persists, you can back up your texts (using Samsung Smart Switch or a third-party app) and then tap Clear data. This resets the app to its factory state, which often resolves deeper corruption.

3. Check the Message Center Number

Every carrier has a special number that handles SMS routing. If it’s missing or wrong, texts won’t send. To view it:

1. Open the Phone app (dialer).
2. Type *#*#4636#*#* – this opens the testing menu.
3. Tap Phone information.
4. Scroll down to SMSC (Short Message Service Center).
5. If it’s blank or shows a wrong number, tap Refresh to pull it from the SIM. If that fails, you’ll need to enter it manually – contact your carrier for the correct SMSC number.

Note: This hidden menu is not available on all variants of the S7 (especially carrier-branded ones). If it doesn’t open, you can also check the number in the Messages app’s settings (but Samsung removed that option on some Android versions).

4. Reset Network Settings

This resets Wi-Fi, Bluetooth, and cellular settings to defaults, which can fix stuck network registrations. It does not delete your personal data.

1. Go to Settings > General Management (or Backup and reset).
2. Tap Reset > Reset network settings.
3. Enter your PIN/password if prompted, then tap Reset settings.

After the reset, your phone will restart and reconnect to your carrier. You’ll need to re-enter Wi-Fi passwords, but your texts and apps are untouched.

5. Check for Blocked Numbers

If you can’t text one specific person, you might have blocked them. To check:

1. Open the Phone app.
2. Tap the three-dot menu (top right) > Settings.
3. Tap Block numbers (or Call blocking).
4. Review the list – if the person is there, tap the minus icon to unblock them.

Also check the Messages app’s own block list (often under Messages > Settings > Block messages).

6. Reinsert or Replace the SIM Card

A loose SIM can cause intermittent SMS failures. Power off your phone, remove the SIM tray (on the top edge of the S7), and reseat the SIM card. If the card looks scratched or old, contact your carrier for a replacement – they’re usually free.

While the SIM is out, inspect the tray for damage. A bent pin in the tray can also cause issues.

7. Update the Phone and Apps

Samsung and carriers periodically release software updates that fix known messaging bugs. To check:

• System updates: Settings > Software update > Download updates manually.
• App updates: Open the Galaxy Store (or Google Play Store) > My apps > update the Messages app if available.

If your S7 is running an old Android version (it originally shipped with Android 6.0 and can be updated to 8.0), some messaging features may be outdated. However, SMS is a basic function and should work on any version.

8. Try a Third-Party Messaging App

If the default Messages app still fails, install a different SMS app like Google Messages or Textra from the Play Store. This isolates whether the problem is the app or the phone’s SMS system. If the third-party app works, you can continue using it or reset the default app as described in step 2.

9. Factory Reset (Last Resort)

If nothing else works, a factory reset will restore your phone to its original state, eliminating any deep software glitch. Back up everything first – photos, contacts, and texts – because this wipes all data.

1. Go to Settings > General Management > Reset > Factory data reset.
2. Tap Reset device > Delete all.

After the reset, set up your phone and test SMS before restoring your backup, to confirm the issue is resolved.

Frequently Asked Questions

Why do my texts send but not deliver?

If the message shows “Sent” but the recipient never gets it, the problem might be on their end (their phone is off, blocked, or their carrier is down). It could also be that your phone is using the wrong message center number – check that as in step 3.

Why does my S7 say “Message not sent” with a red exclamation mark?

This usually means the SMS failed to transmit. Try resending by tapping the message. If it persists, check your signal strength and the message center number. Also ensure you haven’t accidentally enabled “Airplane mode” or turned off mobile data.

Will clearing the Messages cache delete my texts?

No, clearing the cache only removes temporary files like image thumbnails. Your actual SMS conversations are stored in a database that is not touched by clearing cache. Only “Clear data” would delete them.

How do I find my carrier’s SMSC number?

You can call your carrier’s customer service or check their website. For example, Verizon, AT&T, and T-Mobile all have different numbers. The easiest way is to use the *#*#4636#*#* menu and tap “Refresh” to pull it from the SIM automatically.

My texts work in safe mode – what does that mean?

Safe mode disables third-party apps. If SMS works in safe mode (hold power > tap “Restart” > then long-press “Power off” until the “Safe mode” prompt appears), a downloaded app is interfering. Uninstall recently installed apps, especially messaging or battery-saving apps.

Can a bad battery cause SMS issues?

Unlikely, but a failing battery can cause random shutdowns or crashes, which might interrupt an outgoing text. If your S7 is shutting down unexpectedly, consider a battery replacement, but that’s not a common cause of SMS failure.

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