Time Needed : 10 minutes

Before you proceed, check and make sure that your phone is getting a good and stable signal, like at least 2 bars. If your phone is experiencing some signal issues, then that must be the main reason why you cannot send text or SMS messages on your Galaxy S20. In that case, you will need to deal with signal issues first. If there’s no problem with the cellular signal but still SMS sending still fails, try these subsequent methods to eliminate software-related factors that might have caused conflict and ruined your phone SMS features.

1. Force close Messages app then restart.

   You can use the Recents Key to close all your apps including Messages at once. To do so, simply tap the Recent icon to view all running apps and then tap the CLOSE ALL button to end them all. The Recent icon is located at the bottom-left corner of your phone, represented by three vertical lines.Alternatively, you can access the Settings-> Apps menu. Then from the Apps menu, tap the triple-dot icon or quick menu icon located on the top-right corner of the screen to view more settings and options. Select the option to Show system apps and then tap Messages to view its App info and execute the Force Stop command.Doing so will force-close the Messages app.After closing Messages, restart your phone to refresh its internal memory and operating system. It can also help eliminate random glitches caused by minor system conflicts. 

2. Toggle Airplane Mode on and off.

   This is one of the old tricks that’s been proven to work wonders to many smartphone users who have dealt with various network connectivity issues. It works by giving a simultaneous restart to all wireless features of the phone while clearing out any associated errors.To do the Airplane mode trick, simply go to Settings-> Connections-> Airplane Mode menu on your Galaxy S20. From there, you can access the Airplane Mode toggle or switch for you to turn the feature On or Off. When you get there, tap the switch to turn Airplane Mode on. While Airplane Mode is turned on, restart your phone and then go back to the Airplane mode menu to turn the switch OFF again.It would take a few seconds for your device to re-establish wireless signals so just wait patiently. When the signal is steady, retry creating a sample SMS or text message then send it to your own number. It’s problem solved if you receive the sample SMS. Otherwise, you will need to troubleshoot further.

3. Delete old and unnecessary conversations.

   Old messages are supposed to be removed. By doing so, you can free up some space on your phone’s internal storage and at the same time clear out any corrupted messages or conversations containing some malware. If you haven’t already, then you should include old message deletion among the next possible solutions.To delete SMS messages and conversations on your Galaxy S20, open the Messages app from the Home screen then select the individual message that you’d like to remove.To delete an individual message within a conversation, expand the conversation to view individual messages then touch and hold on the message that you’d like to remove.To delete the entire conversation, touch and hold a conversation then mark the option to Select All. After selecting all the messages that you’d like to delete, tap the Trash icon then tap DELETE to confirm.The messages and/or conversations will no longer be seen in the Messages directory.

4. Clear Messages cache and data.

   Like any other apps, the Messages app also stores temporary files as cache and data. These files are typically used by the system to execute repetitive tasks quicker than the first execution. However, as temporary files and cache accumulate, the device’s performance may also become adversely affected. This is usually the case if any of the cached files contained corrupted data. To eliminate these bad files, clearing app cache and data from time to time is likewise recommended.To clear cache and data on Messages, navigate to Settings-> Apps menu. Then find and select Messages from the list of apps. Next, tap Storage then Clear cache or Clear data at the bottom-right of the screen. After clearing cache and data, restart your phone and then relaunch the Messages app.

5. Reset network settings.

   If the prior methods don’t yield a positive outcome, then you may have to consider resorting to some settings reset. It’s possible that some settings on the phone might have been re-modified or configured erratically and that has resulted in some conflicts with the phone’s SMS functions. There are different types of resets you can do on your phone but the most suitable reset to deal with network-related issues is a network settings reset. On the Galaxy S20, you can use the Reset network settings command to clear out all customized network settings and restore the default network configurations.To do this, navigate to Settings-> General management-> Reset menu and then tap the option to Reset network settings. If prompted, tap Reset settings, enter your PIN or password then tap Reset settings again to confirm.All your recent network settings will then be deleted and replaced with the default values and options.