To report a conversation as spam

While reading the email, touch the Menu Key > More > Report spam.

OR

From the Inbox, touch the checkmark box to select the message(s) you want to report as spam, then touch the Menu Key > Report spam .

When you report a conversation as spam, the conversation (and all of its messages) are removed from your Inbox. You can view the messages you’ve marked as spam by viewing messages with the Spam label.