Which city in Japan has the code 00818?

Answer 1

00 isn't part of the code; it is a commonly used international access prefix, but many countries use other prefixes, and some countries use more than one prefix for different types of international calls.

Telephone country code +81 is Japan, but +81 8 is an incomplete area code in Japan. You need one or two more digits to specify a city or town.

(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)