1. In a mobile communication device, a method of processing voicemail messages comprising: storing, in memory, a first dual tone-multiple frequency (DTMF) command set for voicemail message processing functions of a first voicemail system; storing, in the memory, a second DTMF command set for voicemail message processing functions of a second voicemail system which is different from the first DTMF command set for the first voicemail system; receiving, through a wireless transceiver, a voicemail notification message associated with a voicemail message received at one of the first and the second voicemail systems; detecting, through a user interface, an end-user selection of a visual object or switch which is visually indicative of a voicemail message processing function; causing the following acts to be performed in response to detecting the end-user selection of the visual object or switch: selecting, from one of the first and the second DTMF command sets corresponding to the one of the first and the second voicemail systems at which the voicemail message was received a DTMF command code corresponding to the voicemail message processing function; and causing the DTMF command code to be sent to the one of the first and the second voicemail systems for invoking the voicemail message processing function at the one of the first and the second voicemail systems.