In this paper new ways of facing the problem of mobile multimedia source traffic modelling are first discussed. Then, based in some hypothesis for mobility, and for the number of available resources, tele-traffic system capacity results are achieved using a 'macroscopic' model, very useful for cellular planning purposes. This allow for the comparison of capacities among different systems (GSM, UMTS, Enhanced UMTS and Mobile Broadband System), measured in terms of supported data rate per kilometre, and a kind of generalisation of Moore's and/or Gilder's law to mobile communications.