How does iPhone clear all messages?

At present, iPhone can only delete the information of one contact at a time (swipe from left to right or swipe from right to left to select Delete), but not all messages. If you need to delete all conversations of a contact, please enter the contact, select Edit, and then select Clear All. To delete only conversations, select Edit, click the conversation you want to delete, and then select Delete. (The above content is only applicable to Guangdong Unicom users)