LG Lucid VS840 Owner's Manual page 112

Communication
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message limit is reached. Remove the checkmark to keep all of your
messages.
Text message limit Touch to set the number of text messages to save per
thread.
Multimedia message limit Touch to set the number of multimedia
messages to save per thread.
Signature Opens a dialog box to enter a signature to automatically send
with your messages. Checkmark appears after a signature is entered.
Callback number Opens a dialog box to view or edit the callback number
sent with your messages. Checkmark appears after the dialog box is closed.
Text message (SMS) settings
Delivery reports Checkmark this setting to allow your phone to receive
delivery reports for the text messages you send.
Set priority Opens a dialog box that allows you to set the default priority
for your text messages.
Multimedia message (MMS) settings
Delivery reports Checkmark this setting to allow your phone to receive
delivery reports for the multimedia messages you send.
Auto-retrieve Remove the checkmark to download only the heading
of multimedia messages, allowing you to manually download the whole
message when you're ready. This is useful for controlling how much data
you download.
Roaming auto-retreive Checkmark this setting to allow messages to be
received even if you are roaming outside of the network.
Set priority Opens a dialog box that allows you to set the default priority
for your multimedia messages.
Group conversation settings
Group conversation Checkmark this setting so that message recipients
can see who received the message and reply to them.