+1 is the telephone area code for countries in North America. Area 1 is the North American numbering plan area. The long-distance codes of these countries are all 001, such as the United States and Canada.

The long-distance area code codes of all countries and regions in the world are allocated according to regional standards in accordance with the E.164 standard of the International Telecommunication Union. The global phone number is divided into 9 number areas, ranked from 1-9. 0 is a reserved number. Area 8 is the East Asia region and special service numbers. For example, China's long-distance area code is 0086.

All international telephone area codes are prefix numbers, which means that these numbers are used to "dial" the destination country or special administrative region. The general order of making international calls is: international prefix code - international telephone area code - domestic telephone area code - open telephone number; international prefix code - international telephone area code - closed telephone number. The international telephone area code for mainland China is "0086".

Extended information:

The international telephone area code of mainland China is "0086". Area 2 is the African number area, and the telephone area codes of all African countries begin with 002.

There are also some numbers in other regions. Area 3 and Area 4 are both European numbering areas, and most countries in Europe use these two digits as codes. Area 5 is the country code area for Mexico and Central and South America. Area 6 is the country number area in Southeast Asia and Oceania.

Area 7 is the country code area of ​​Russia and some parts of the former Soviet Union. Area 8 is the East Asia region and special service numbers. Area 9 is the country number area for West Asia, South Asia and the Middle East.

People's Daily Online - How are the area codes of various countries and regions arranged?

Baidu Encyclopedia - International telephone area codes