Modern telecommunications in Thailand started in 1875 with the deployment of the first telegraph service. Historically, the development of telecommunication networks in Thailand were in the hands of the public sector. Government organisations have been established to provide telegraph, telephone, radio, and television services, and other government agencies, especially the military, still control a large estate of radio and television spectra. Private telecommunication operators initially acquired concession agreements with state enterprises. For mobile phone services, all the concession has been amended by successive government to last 25 years and will gradually end in 2015. For other services, the concession terms and conditions vary, ranging from one year to fifteen years. Nearly all of the concession are built-own-operate type of contracts or BTO. The private investor has to build all the required facilities and transfer them to the State Owned Enterprises before they can operate or offer services to public.