Quay số “011” trên bàn phím. Thêm mã vùng. Quay mã vùng khu vực/thành phố (nếu có). Nhập phần còn lại của số điện thoại.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Use the International Direct Dialing (IDD) number for the U.S. before dialing any other numbers. This signals that the phone number you will dial next is outside of the United States.  Remember that “011” is the prefix for only the North American Numbering Plan. If you are placing a call from a country other than the U.S., you will need to find the IDD for that country.  Sometimes international phone numbers will be listed with a “+” symbol before the digits of the phone number. If you are diali