How a number with +86 is written
International format: +86 1XX XXXX XXXX
National format: 1XX XXXX XXXX
Inside China a number starts with the trunk prefix 0; drop it after +86.
Mobile number length: 11 digits after +86
Calling a China number from abroad
From another country, dial + (or your exit code: 00 in most of the world, 011 from North America), then 86, then the national number without its trunk prefix.