How to not delete all SMS messages on Apple devices?

1.There are many text messages on iPhone and Apple. How to quickly delete SMS on Apple iPhone in batches?

2. Open the Apple iPhone settings;

3. Find GM in the settings of iPhone and Apple mobile phone, and click Enter;

4. Find the date and time in the general settings of Apple iPhone, and click Enter;

5. Turn off the automatic time setting function, and you need to manually set the time to 30 days later;

6. After setting the time, go back to Apple iPhone and find the information. Click to enter, and the information history will be permanently retained by default;