Thread: CharlieCards v.v. Oyster (and Octopus?)
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Old April 2nd 12, 10:07 PM posted to uk.railway,uk.transport.london,misc.transport.rail.americas
Adam H. Kerman Adam H. Kerman is offline
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Posts: 167
Default Telephone line numbers, prefixes, and area codes
wrote:

Originally Mexico was to have an area code, but that was changed to a
separate country code. Not sure why, it would seem to make sense to
make it part of NANP.

Northwest Mexico and Mexico City were dialable without country code
with two special three digit area code-like trunk codes within the NANP.
That ended when those three-digit numbers were assigned as area codes in
the early 1990's. The telephone system of northwest Mexico had US investors,
which explains that. I assume Mexico City was for convenience, probably
the vast majority of the calls anyway.

I don't know if AT&T ever reserved area codes to any other countries for
future expansion of NANP.
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