dialling code
noun/ˈdaɪəlɪŋ kəʊd/
/ˈdaɪəlɪŋ kəʊd/
(also code)
(British English)- the numbers that are used for a particular town, area or country, in front of an individual phone number
（电话的）区号 - international dialling codes
国际区号
- international dialling codes