• From abroad: dial +86 (or your country's exit code, e.g. 00 from Europe, 011 from North America), then the national number without the leading 0. Example: +86 131 2345 6789
  • Within China: dial the number as written domestically, including the trunk prefix 0. Example: 0 131 2345 6789
  • Calling abroad from China: the international prefix is 00|1(?:[12]\d|79)\d\d00, or simply use + on mobiles.
  • Storing numbers in software: always store E.164 (+8613123456789): unambiguous, sortable, and what SMS and telephony APIs expect.