Until September 1999, East Timor (now Timor-Leste) formed part of the Indonesian numbering plan, using the country code 62, followed by area codes for the two largest cities, Dili (390)[1] and Baucau (399).
[3] Originally, the 672 code had been allocated to the then Portuguese Timor, before its invasion and occupation in 1975.
[4] A new country code, 670, was allocated to East Timor, but international access often remained severely limited.
A complicating factor is that 670 was previously used by the Northern Marianas, with many carriers not aware that the code is now used by Timor-Leste, and that the Northern Marianas, now part of the North American Numbering Plan, use the code 1 and the area code 670 instead, although calls to the Northern Marianas from the US are billed as calls to Timor-Leste.
You can help Wikipedia by expanding it.This article related to telephone numbers is a stub.