Select Menu > Messaging and More > Message settings.
Select from the following:
General settings - Set the font size for messages, and activate graphical smileys and delivery reports.
Text messages - Set up message centres for text messages and SMS mail.
Multimedia messages - Allow delivery reports and the reception of multimedia messages and advertisements, and set up other preferences related to multimedia messages.
Service messages - Activate service messages, and set up preferences related to service messages.