This report examines the development of the fixed-mobile convergence and fixed-mobile substitution market in Australia.The aim of this report is to give the Australian Communications and Media Authority an enhanced understanding of Fixed-Mobile Convergence and Fixed-Mobile Substitution trends in Australia, and their impacts on the communications sector. Other ACMA research has examined changing consumer use of fixed and mobile services and this report complements that earlier work by looking at changes in the supply of those services.