The area code 868 is assigned to Trinidad and Tobago, a member of the North American Numbering Plan (NANP).

[2] Due to a long established affiliation with NANP,[3] phone numbers in the Republic of Trinidad and Tobago are often styled as "(868) NXX-xxxx".

However, the International Telecommunications Union's standards such as E.164[4] and E.123 both strongly advocate the inclusion of a "+1" prefix to indicate "868" is a part of the NANP.

[6] With the end of permissive dialing on 31 May 1998, all calls placed to the Republic of Trinidad and Tobago required the use of the +1 868 prefix.

[6] The local telephone regulator proposed the area code 868, which corresponds to "TNT"—an abbreviation for Trinidad and Tobago—to reflect the nation's identity within the NANP.