Why can you not swipe to delete text messages? But you can do it in emails? Same with recent CALLS.. you can't swipe to delete. Please Apple! Be consistent!
You CAN swipe to delete texts. Swipe left, then when then red box appears tap Delete.
Truthfully, I'd say iOS is probably the most consistent operating system available.
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That additional tap on the delete button is there by choice.. Unlike emails, you can't recover text messages and recent calls from a 'Deleted' folder, because there is none.
So as a means of precaution, you have to tap the delete button one more time.