1. A method of presenting a chat session on the display of a wireless mobile unit, comprising: showing, on the display, a chat conversation that is progressively updated so that messages included in the conversation scroll on the display; providing a user-operable switch for selectively activating an edit text message function; and in response to user activation of the edit text message function via the user-operable switch, presenting a text edit area on a portion of the display while continuing to show the chat conversation on another portion of the display.