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Why did my classmate send me a text message with +86 in front of his number?

China area code is 86.

This is determined by the International Telecommunication Union according to the geographical location and time zone, and it doesn't make much sense!

All area codes are allocated according to the International Telecommunication Union's E. 164 standard.

All numbers are prefix numbers, which means that these numbers are used to "dial" the destination country. Each country also has a prefix "set aside" its own country.