Where is telephone country code 00 1 877?

00 is a common international access prefix, and +1 is the country code for North America (USA, Canada, and 18 Caribbean-ish islands). Area code +1 877 is domestic toll-free numbers in North America. Calling from outside North America, the call may go through with the caller paying ordinary international toll rates, or the call may fail.

Alternatively, in some areas, the international access prefix is 001, which would leave country code +877, which is assigned for some future maritime mobile telephone service. It is best to quote an international telephone number beginning with the plus sign and country code, omitting any access prefix.

(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.)