1. "Area code" refers to a specific code assigned to a geographic area for telephone purposes. For instance, the area code for Beijing is 010, while Shanghai's is 021, and Guangzhou's is 020, among others.2. "Country code" signifies a numeric code that represents a specific country. Commonly used for international dialing, China's country code is +86, Germany's is +49, and the United Kingdom's is +44, to name a few.3. Example sentence: "The area code for central London is 071." This means that if you're calling from outside the UK, you would start your dialing sequence with 071 to reach central London.4. "Please tell me the area code and the phone number." This request is asking for the specific codes and numbers needed to make a phone call.5. "I must have got the wrong area code." This statement indicates that the person dialed an incorrect area code, resulting in an incorrect phone number.6. "Could you tell me the country code in Japan?" This inquiry is seeking the necessary code to dial Japan from another country.7. "Please write down the country code, the area code, and their number." This instruction is for someone to jot down the codes and phone number needed for an international call.Expansion materials related expressions: zip/post code - postal code8. "Workers in the post office classify letters according to the zip code." This shows how postal codes are used to organize mail within a postal service.9. "Can I have the zip code for New York?" This is a request for the postal code used in New York.10. "Please write the recipient's address, do not forget the post code." This reminder is to ensure that the full address, including the postal code, is included when addressing a letter.