How does Apple 7 delete all text messages?

Because how to delete all messages and talk, you can click on the message first, then click on one, then press for a while, and then everything will come out. Just click on all, so you can delete the message, then update it, and even delete all the programs you use in the right box. In fact, this short message is very deep. If you want to delete it, just delete all the long tails.