The use of such telecommunications equipment must follow prevailing international provisions, i.e. the principle of not causing interference and being in accordance with its allocation. Paragraph (2) The prohibition to use radio frequency spectrum or satellite orbit within Indonesian air space is intended to protect state security and to prevent harming the operation of telecommunications. Aeronautical mobile service means the telecommunications between aeronautical stations and aircraft stations and inter-aircraft stations, which may also cover rescue vehicle stations, and radio call stations for emergency directions. Paragraph (3) Self-explanatory. Article 37 The reciprocity principle as intended in this article is the international relations principle to give the same treatment to foreign diplomatic envoys in Indonesia as is given to Indonesian envoys in the Country Concerned. Article 38 Acts, which may cause disturbances to telecommunications operation, may be in the form of : a. physical acts causing damage to a telecommunications network, so that the telecommunications network cannot function properly; b. physical acts causing telecommunications connections to not operate as intended; c. the use of telecommunications devices which not compatible with prevailing technical requirements; d. the improper use of telecommunications devices operating by radio waves which may cause interference with other telecommunications operations; or e. the improper use of non-telecommunications devices so as to cause undesirable technical effects to a telecommunications operation.