How can I delete all SMS messages?

[Shore_break]

Hello,

I recently tried to delete all the SMS messages on my Galaxy S7 (Nougat 7.0) via the stock Messenger app, SMS Backup & Restore and Textra, but have not been able to get rid of them. I've searched around, but have been unable to find anything that works. Any suggestions?

Thanks!

 

[ManiacJoe]

Are you saying that you are having problem deleting the messages all at once?
Or, are you saying that the message will not delete, even one at a time?

 

[Shore_break]

I've tried to delete them all through various apps, but they will not go permanently.