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What is the area code of Ho Chi Minh City, Vietnam, and how to dial the mobile phone?

International prefix+country code+area code+user number. For example, call the Vietnam National Cooperation and Investment Committee at 253666, and the dialing sequence is 00+84+4+253666. 00 is the international crown word, 84 is the country code of Vietnam, 4 is the area code of Hanoi, and 253666 is the telephone number of Vietnam National Cooperation and Investment Committee. Emergency Telephone: Hanoi: Public Security-13 Fire Fighting-14 Emergency. +07 Obstacle Station-19 International Toll Station-1 1 Ho Chi Minh City: Gongan -65438. 90898 Directory Assistance-12 International Toll Station-13 Vietnam Country and Region Code -84 Hanoi. 29 1 Haiphong -39 1 Tushan -3 13 Hedong.