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How does iphone delete SMS deletion time?

The steps are as follows:

1. Open the iphone and click "SMS".

2. Enter the SMS page and click "Edit".

3. Select the SMS to be deleted in batch, and click "Delete" in the lower right corner.

4. If you only want to delete one of the messages, we will press and slide the message to the left, and a delete button will appear. Click "Delete" to delete the message.