If calling from the UK its 001 + the area code, then the number.
it is 00 followed by 1 then area code then number, like UK calling from Ireland 0044 etc
The format for an American phone number is a 1, followed by a three digit area code that varies based on where that person lives, and then their 7 digit phone number.
Sweden
Egypt
This international dialing code for China is 0086, therefore 008613 is somewhere in China.