1 – United States, including United States territories: 1 (340) – United States Virgin Islands.
1 - United States, Canada, and several Caribbean nations share the international calling code 1, with each US state (or parts of US states), province, territory, or island nation given its own three-digit "area code".
“1,” of course, is the country code for the United States.
001, or +1 is the telephone calling code of North America; which includes Canada, the United States and the Caribbean.
Begin the number you're dialing with a “1”, this is the Canada country code from the United States. Move on to dialing the area code for the region of Canada that you are dialing.
Canada is situated in North America and comes under the North American Numbering Plan (NANP). Since all NANP countries have the same country code, "1", you may call from the US to Canada by dialing 1 before the desired number.
Calling the USA: +1 is the US Country Code.
For calls to USA from Australia dial: 0011 + 1 + area code + telephone number. For calls from USA to Australia dial: 00 + 61 + area code + telephone number.
North America (Country Code: 1)
You dial these numbers like you dial any long distance call within the U.S., which is: the country code 1, the 3 digit area code, and the 7 digit phone number.
The countries that were most influential in the telecommunications union, combined with those who had the largest population, were given the shortest and thus the simplest codes to enter. Therefore, it may not be surprising that the US and Canada received the single-digit country code +1.
It's from a phone system that is spoofing (faking) the phone number, and has set it to all zeros. While there are legitimate uses for number spoofing (such as displaying main incoming number no matter what line is used), you can be pretty sure one using all zeros is a spam call, and you can click 'ignore'.
Officially, all calls to US numbers begin with a “+1” because that is the region code for North America and the Caribbean (technically, the North American Numbering Plan or NANP). That's why your phone displays a “1” before the number; it really is part of the number.
What this means for you. If you dial "0", "00", 411, NPA+555-1212, or 555-1212 on or after January 1, 2023, you may receive a message letting you know that Operator and Directory Assistance can't be accessed.
Calling to/from Mexican cell phones
Do not include the old 044 or 045 in the code. Calling a Mexican cell phone from overseas: Dial Mexico's country code (+52) then the area code, and then the number. Do not include the '1' after the +52, as was required before August 2019.
"+" signifies the international dialing prefix, "1" indicates the country code, in this case USA.
Written Numbers
A European's handwritten numbers look different from ours. The number 1 has an upswing, and the number 4 often looks like a short lightning bolt. If you don't cross your 7, it may be mistaken as a sloppy 1, and you could miss your train.
The entities that are within the North American Numbering Plan – the United States and its possessions, Canada, Bermuda, and several Caribbean nations — share the international "country" code 1, with each state (or parts of states), province, territory, or island nation given its own three-digit "area code".
It has a four-digit area code (after the initial zero) and a six digit subscriber number, and is known as 4+6 format. These area codes were changed by adding a "1" directly after the initial zero as a part of PhONEday in 1995. Just short of 581 areas use this format, and the area codes range from 01200 to 01998.
The standard American telephone number is ten digits, such as (555) 555-1234. The first three digits are the "area code," which, in the past, indicated in what part of the country the phone was located.
Simply dial 1, the area code, and the number you are trying to reach. To call a phone in another country, dial 011, and then the code for the country you are calling, the area or city code, and the phone number.