LG -P509 - Manual (Page 83)

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WARNING: The 10-character limit
may vary from country to country depending on
how the SMS is coded and language.
WARNING: If an image, video, or
audio file is added to an SMS message, it will be
automatically converted into an MMS message,
and you will be charged accordingly.
NOTE: When you get an SMS message
during a call, you will hear a ring notification.
Threaded box
Messages (SMS, MMS) exchanged with another
party can be displayed in chronological order so
that you can conveniently see an overview of your
conversation.
Using smilies
Liven up your messages using smilies.
When writing a new message, press the Menu Key,
then choose Insert Smiley.