I don't know about an area code being used in Saudi Arabia for the
convenience of the oil industry. But this topic came up with respect
to Kuwait (I guess at the time it was invaded August 1990 by Iraqi
forces), and no one had an answer for that.
[Moderator's Note: Yes, Saudi Arabia had an international country code
like all other countries, but it also had an 'area code' which could be
dialed from the USA for the administrative convenience of some people.
The oil industry? I dunno. Anyone remember the 'area code' number, and
does it still work today? PAT]