The present invention relates to a mobile telecommunication terminal (1) comprising display means (6), loudspeaker and microphone means and means for communication with other mobile or non-mobile communication terminals over a first connection supporting communication of speech. Said mobile telecommunication terminal (1) further supports transmission to, and representation of, proprietary customized visual/graphical data information 1.sub.AO, e.g. avatars, on other communication terminals (2), as well as representation on the display means (6) of such customized visual/graphical information from said other communication terminal(s) (2). The proprietary customized visual/graphical data information can be altered, the telecommunication unit (1) comprising control means for altering the proprietary customized visual/graphical information, and the proprietary customized visual/graphical information can be altered or updated during an ongoing speech connection with one more of said other communication terminals over said first connection. The invention also related to a system and a method supporting such a functionality.