In some situations, only the removal and analysis of the phone's memory chip, a process that will destroy the phone, will allow for the recovery of deleted text messages. (slaw.ca)
Isn't the whole idea of that thing where you cross out the 85 % instead of just deleting the text to show something better? (blog.us.playstation.com)
After deleting the text layers, you will see only one layer which is background. (mashdesigning.com)