-
Country Code - The
country code is the national prefix to be used when dialing to
that particular country from another country. In some cases you
will also need to dial a city or area code.
-
IDD Prefix
(International Direct Dialing) - The
IDD prefix is the
international prefix needed to dial a call from the country listed
to another country. This is followed by the country code for the
country you are calling.
-
The
IDD situation in
many countries has been changing regularly. Some countries like
Singapore have
multiple
IDDs, with each one used by a different long-distance
carrier.
-
NDD Prefix (National
Direct Dialing) - The NDD prefix is the access code used to make a
call within that country from one city to another (when calling
another city in the same vicinity, this may not be necessary). The
NDD is followed by the city/area code for the place you are
calling.
-
* These countries are
part of the North America Numbering Plan (NANP), though they may
be far removed from North America (and Mexico is not
included). The country code for all NANP countries is 1; the
numbers that follow are used as area codes in the U.S. and Canada
and function similarly in other NANP areas.
-
** Await a second tone
at this stage.
-
Singapore
International Dialing Code by Telco Prefix,
Check Here.
