Threaded SMS
Text messages that are sent to and received from a contact (or number) are grouped as a single thread in your inbox. Threaded SMS lets you see exchanged messages (similar to a chat program) with a contact on the screen.
To reply to a text message:
1.In the Text Messages Inbox, tap a message thread to open it.
2.At the bottom of the screen, type your reply message and then tap Send.
Type your message here 
To delete a message in the thread:
1.In the Text Messages Inbox, tap the message to open it.
2.Select the message in the thread you want to delete.
3.Tap Menu > Delete.
88 Section 7: Exchanging Messages
