LG G Vista - Manual (Page 103)

101 Communication
To respond to messages you receive
While viewing the received message, tap the text field at the bottom of the
screen, complete your response as necessary, then tap the Send button
(on the right side of the text field).
Changing Messaging Settings
 To change the Messaging settings, open the Messaging app, tap the
Menu icon (at the upper-right corner of the screen) > Settings.
Set default SMS app
Sets the default app to use for your messaging (also accessed through the
Wireless & networks settings). Choose from Messaging, Hangouts, and
Messages+. This option is only available when Messaging is not set as the
default messaging app.
Storage
Delete old messages: Checkmark to allow the phone to delete older
messages in a thread when the Text message limit or Multimedia
message limit is reached. Uncheckmark this setting to keep all messages.
Text message limit: Tap to set the number of text messages to save per
thread.
Multimedia message limit: Tap to set the number of multimedia messages
to save per thread.
Attachment storage: Sets where to store your attachments. Choose
Internal storage or SD card.
Signature: Checkmark to automatically add a signature that you set.
Callback number: Checkmark to automatically enter a callback number. The
default is the phone number, but you can change it to another number.
Text message
Delivery reports: Checkmark to allow your phone to receive delivery
reports for the messages you send.