Nối tiếp phần 1, phần 2 của tài liệu Hướng dẫn sử dụng các dịch vụ viễn thông quốc tế trình bày các nội dung về hỏi - đáp sử dụng các dịch vụ viễn thông quốc tế, các dịch vụ thuê bao tự quay trực tiếp đi quốc tế, các dịch vụ điện thoại có sự trợ giúp của điện thoại viên. Mời các bạn cùng tham khảo để nắm nội dung chi tiết.
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