You've deleted all old text messages and then realized that you do need some or all of your old messages. Actually, text messages don't get deleted. It is possible to recover them. If you have a previous backup with iTunes or iCloud, you can easily get what you want. Otherwise, third-party software is needed to restore the deleted messages from iPhone to your computer.
Retrieve Deleted Text Messages on iPhone 6 Plus/6/5s/5c/5/4s/4/3GS Tutorial.
In this article, Free Any iPhone Data Recovery software is the editor's picks to teach you how to recover deleted text messages on iPhone. It is comprehensive iOS data recovery software for iPhone, iPad and iPod Touch. And you can recover up to 19 type files, such as text messages, photos, videos, contacts, notes, reminder and so on.
Download this Free Any iPhone Text Message Recovery and try it now.
Step 1. Connect your iPhone to computer. Run this software and click on "Recover from iOS Device" and hit "Start" button to continue.
Step 2. Preview messages and select text messages you need to recover.
Step 3. Click "Recover" button to retrieve and save accidentally deleted text messages to your computer.