Apple iPhone iOS 8.4 - Manual (Page 82)

Chapter 9 Messages 82
Messages settings
Go to Settings > Messages, where you can:
•
Turn iMessage on or off
•
Notify others when you’ve read their messages
•
Specify phone numbers, Apple IDs, and email addresses to use with Messages
•
Set SMS and MMS options
•
Show the Subject field
•
Block unwanted messages
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Set how long to keep messages
•
Filter unknown senders
•
Manage the expiration of audio messages and video messages created within Messages
(audio or video attachments created outside of Messages are kept until you delete
them manually)
Manage notifications for messages. See Do Not Disturb on page 37.
Set the alert sound for incoming text messages. See Sounds and silence on page 36.