As far as I know, many people only choose the deletion option or factory settings restoring to delete some files they don't need. But tell you the truth, neither the two methods can delete files permanently. To wipe text messages completely, the most secure way is using professional third-party software like iPhone Data Eraser, which is specially designed to erase iPhone text messages, contacts, photos, videos, emails, account info, passwords, etc.
|Clean iPhone data permanently|
100% Erase iPhone SMS without restore with iPhone Data Eraser software
iPhone SMS Bulk Deletion is able to delete your iPhone mass messages, without manually deleting the bulk SMS one by one.
Differ from the the deletion option or factory settings restoring, the deletion performed by iPhone Data Eraser software is permanent and no any data recovery software can recover back the deleted files. Follow the steps as below to learn how to erase text messages from iPhone 6/5S/5C/5/4S/4/3GS.
How to Erase All SMS Messages from iPhone Permanently?
--Erase Your iPhone & iPad Protect Your Privacy Messages
Step 1: Connect iPhone to Computer and Run Software
Click the download button from above to get the installation package of the software. Install it and click the shortcut icon from the desktop to launch it on your computer. Then, connect your iPhone to the computer via Apple provided USB cable and you will see the program detect the iPhone automatically.
Step 2: Choose Lever of Data Erasing as You Want
The program provides you with three different levers for erasing data: Low - Medium - High. You can directly choose the default second Medium lever, which will leave no traceability of data erasure and use random data to overwrite all existing and deleted data on your iPhone.
Step 3: Start to Erase text messages on Your iPhone
Choose the text messages you want to delete from your iPhone and click the option of erase all data and settings to delete them all from your iPhone.
We kindly suggest you backup all the data you don't want beforehand because the deletion perform by the software is 100% permanent and you can't recover the deleted files any more.
Quickly free up valuable space by cleaning your phone of invalid files, cache files & more. Simply put, iPhone data eraser software optimizes your phone by removing the junk that you cannot. By accessing background processes, iOS Data Eraser makes keeping your phone optimized as easy as a click.
Speed Up Your iPhone:
Without temporary and other junk files slowing your device down, you will notice faster and more efficient operation of your device.
Read more: Erase junk files on iPhone to speed up iPhone