PAT: PLEASE suppress my email address where-ever it might appear in the headers, in order to try to reduce $pam. Thanks.
What gets me is how many US (and possibly Canadian) companies who advertize their contact numbers, both toll-free 800, 888, 877, 866, etc, as well as POTS numbers on TV, which is just as worldwide as the Internet is these days, as follows:
Call Toll Free: 1-8YY-NXX-XXXX within the US (and Canada) Outside the US and Canada: NPA-NXX-XXXX
Note that they use the 1+ access prefix for toll-free calls within the US (and Canada), but when they display their POTS number for access from outside North America, they don't show any "leading '1'" digit.
However, that leading '1' should really be maintained especially for a full international format! While a leading '1' wouldn't necessarily be an "access prefix" for calls from outside of North America, a "leading '1'" digit on the POTS number would indicate to callers from outside North America that the call is indeed an international or overseas call to *country code '1'*, aka "world zone '1'", which is the North American Numbering Plan of the US, Canada, and many Caribbean Islands.
These days, more and more businesses outside of the US and Canada are listing their full international number in adverts and such. You are seeing more numbers displayed on the Internet and elsewhere (if you see non-US/Canadian ads and such), as +44 etc (for the UK) or +81 etc (for Japan), +33 etc (for France) etc.
Even if a US (or Canadian) POTS number is displayed in (worldwide) ads without a '+' sign, as long as a leading '1' is shown, i.e.,
1.311.555.2368 or 1 311 555 2368 or 1-311-555-2368 or 1+ 311 555-2368 or something like that, callers elsewhere in the world from outside North America should have no difficulty in realizing that the call is intended for the US (or Canada).While in the US or Canada, we know that 416-NXX-XXXX is Toronto, some callers from outside the US or Canada might mis-dial the call to Switzerland (country code +41). Thus a Toronto business displaying their number really should show it as 1-416-NXX-XXXX. Thus a caller from elsewhere in the world would know that this is a number in North America.
Businesses in Birmingham AL should really add a leading '1' in some way to 205-NXX-XXXX, as 1-205-NXX-XXXX, so that callers elsewhere in the world won't mis-dial or mis-think the number as in Egypt, country code +20.
Businesses in Fort Worth TX who display their number simply as
817-NXX-XXXX, might be misconceived by callers from elsewhere in the world, who might mis-dial the call to Japan, country code +81.While I do live in North America, and the vast majority of my telephone calling and business is strictly within the US and Canada, I do realize that there is the rest of the world, outside of the North American Numbering Plan, and that we are now truly in a global economy and global communications network, telephone, internet, media, etc.
The "leading '1'" in front of a ten-digit North American number is NOT irrelevant, but also conveys the *country code* of the NANP, particularly for those who live outside of the US/Canada and are trying to call that US/Canadian telephone number.