Modern telecommunications in Thailand began 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 were 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 concessions have been amended by successive government to last 25 years have gradually ended in 2015. For other services, the concession terms and conditions vary, ranging from one to fifteen years. Nearly all of the concessions are build-operate-transfer (BTO) contracts. The private investor has to build all the required facilities and transfer them to the state before they can operate or offer services to public. Liberalisation took place in the 1990s and 2000s. State enterprises, the Telephone Organization of Thailand, Communications Authority of Thailand, and Mass Communication Organization of Thailand, were corporatised in 2003 and 2004. The Constitution of 1997 prompted the institutional changes when it declared that all the spectrum is a "national communication resource for public welfare". The 1997 Constitution further requires the establishment of "an independent regulator" who shall be authorized to allocate spectra and monitor and regulate communications in Thailand. In 1998, to comply with the constitutional mandate, the parliament passed a law establishing two independent regulators, the National Telecommunication Commission (NTC) and the National Broadcasting Commission (NBC). The regulatory practice began in Thailand when the NTC was appointed by the king through the complex nomination procedure in 2005. The inception of NTC automatically terminates and transfers all power and authority in telecommunication sector from the Post and Telegraph Department (PTD) to the newly established independent commission. In September 2006, the military wrested control from a civilian government and merged the telecommunications and broadcasting regulators into a convergence regulator. The task had not been completed when a civilian government came into power and introduced the new bill. The new law dubbed the Act on Spectrum Allocation Authority, Regulatory & Control over Radio & TV Broadcast and Telecommunications of 2010 (aka NRA Act of 2010), eliminated the NTC and created a new "convergence regulator" to manage both telecommunications and broadcast in Thailand. The new law also requires that the National Broadcasting and Telecommunications Commission which was established in 2010 as an