A telephone area code is a sequence of numbers assigned to a specific geographic area, such as a city or region. We need it to identify where a landline phone number is located and to ensure that calls are directed to the correct phone line. The telephone district and area code must make calls between two different areas. Generally, a call can be made within the same area without adding the code. But, while making calls between two districts or from different telecom, it is required to call on the landline telephone.