The parts of a telephone number are a code map that routes a call. The first three numbers are the area code, sometimes called the national destination code (NDC). These three numbers send the call to the correct regional switching station. Following the area code are the three numbers known as the exchange. The exchange is the smallest number of circuits that can be bundled on the same switch. The four numbers at the end of a 10-digit number are the subscriber number. These make up your personal number, which represents your address and phone line.
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