Deleting a conversation moves it from your Message Inbox to Deleted Conversations. The conversation isn't deleted for any other member, and if it's a group message, other group members can still message each other. You won't receive notifications for any messages you delete in a conversation.
Deleting a Conversation
In a conversation, tap the Delete (trashcan) icon to move the conversation from your Message Inbox to Deleted Conversations. You'll be prompted to confirm this action. Any other conversation members will be notified that you have deleted the conversation and won't see any new replies.
Restoring a Conversation
To restore a deleted conversation, in the Message Inbox, tap Deleted Conversations. Tap the Undo (arrow) icon to return the conversation to your Message Inbox.