LG VS910 - Manual (Page 104)

102
Communication
To reread a message
When you open a conversation, messages that you’ve already read are
minimized into a tab that indicates the number of hidden messages.
1. Touch the Apps Key > Gmail . Then touch the conversation you
want to view and the tab indicating minimized messages.
2. Touch the contact name to open that message.
When reading a message you can touch the Menu Key > Mark
unread to return a read message to the unread state. For example, to
remind yourself to read it again later.