THE worldwide move towards creating independent regulators for public services arrives locally this week when the Office of the Telecommunications Authority starts work. And its director says one of his first priorities will be to get anyone interested in the subject to make more noise. ''No one should be asked to regulate in a vacuum,'' said Alex Arena, who becomes OFTA's director when it begins operation on Thursday. He has already noted a big difference from his previous base in Australia, where he was on the board of OFTA's equivalent, Austel. There, politicians, companies and the general public are often more than vocal in indicating what they want. One of his first jobs will be to try to set up consultative arrangements to avoid acting on ''filtered information'', although he agrees this is something of a break from the past and not everyone will welcome it. He describes the body as a ''one-stop shop'' with duties much wider than similar bodies elsewhere. They will include responsibility for policy implementation, creating technical standards and radio communications. Only the biggest, strategic decisions will be left in the hands of the Government's Economic Services Branch. It will have 241 staff, of which 26 will be new posts and 215 will come from the Postmaster-General's department. This compares with 140 staff in Austel and 160 for the UK regulator. It will be a quasi-judicial body, with no appeal against its decisions. Mr Arena describes himself as ''pro-competition and pro-consumer'', terms he regards as largely equivalent. Yet Hongkong is standing apart from the worldwide trend towards deregulation because of the 25-year monopoly licence on international calls awarded to Hongkong Telecom in 1981. In almost every other area, he notes, Hongkong has more competition than consumers worldwide could ever believe. Yet one of his other initial tasks is to look through the Hongkong Telecom international licence, which he describes as ''less precise than one might prefer''. He wants Hongkong Telecom and its competitors to know the boundaries of its monopoly to avoid ''trench warfare over an ill-defined and broad no man's land'' - something that quickly drains its resources from other areas which also need work.