Why does the USA have country code 1 instead of a higher number?

The ITU assigned country code 1 to North America in the 1960s because the US and Canada were among the first nations to deploy direct international dialing, and shorter codes were given to regions expected to receive heavy international call traffic. The numbering system, called the North American Numbering Plan (NANP), was created by AT&T in 1947 and predates most other country codes. Russia got 7 for similar reasons. Most other country codes were assigned later in two and three-digit format as more countries adopted direct dialing.

Why does my Dominican Republic number cost international rates from the US?

Because despite sharing the +1 country code, the Dominican Republic (area codes 809, 829, 849) sits outside the US-Canada domestic rate zone. Most US carriers treat calls to +1 Caribbean numbers as international, with rates ranging from $0.10 to over $1 per minute. The same applies to Jamaica (876), Bahamas (242), Trinidad (868), and the rest of the +1 Caribbean. Verizon, AT&T, and T-Mobile each publish a separate international rate table that lists the +1 Caribbean countries individually — your "unlimited US" plan doesn't include them.

Is the Dominican Republic the same area code as Puerto Rico?

No. Puerto Rico uses area codes 787 and 939. The Dominican Republic uses 809, 829, and 849. Both fall under the +1 country code, but they're separate territories with separate phone networks. Puerto Rico is a US territory and is treated as domestic by most US carriers for billing purposes. The Dominican Republic is an independent nation and bills as international. So a call from New York to San Juan is usually free on an unlimited plan, but a call to Santo Domingo costs international per-minute rates.

Can I use my Canadian phone number to receive US SMS verification codes?

Usually yes, but with caveats. Canadian numbers sit under the same +1 country code as US numbers and most US services (banks, Google, Microsoft, social media) accept Canadian numbers as if they were domestic for SMS verification. Some US financial services (Chase, Wells Fargo, IRS Identity Verification) restrict 2FA to US-based numbers only, and they detect the carrier prefix to reject Canadian, Caribbean, or US-territory numbers. If you're moving to Canada and need to keep US-bank 2FA working, set up Google Voice or a US VoIP number (Telnyx, NumberBarn) before switching primary numbers.

+1 Country Code: US, Canada & Caribbean Explained

The +1 country code covers the United States, Canada, and about 20 Caribbean nations. It's not just "the US code"—it's shared by 25+ countries under the North American Numbering Plan (NANP). The 3-digit area code after +1 tells you which country or region you're calling.

So if you're trying to figure out what country uses +1, the answer is: it depends on the area code.

What Country Uses +1?

The +1 country code isn't exclusive to any single country. Here's who shares it:

United States - All 50 states plus DC
Canada - All provinces and territories
US Territories - Puerto Rico, Guam, US Virgin Islands, American Samoa, Northern Mariana Islands
20+ Caribbean nations - Jamaica, Bahamas, Dominican Republic, and more

The system exists because these countries all joined the North American Numbering Plan in the mid-20th century. Same country code, different area codes.

Complete List of +1 Caribbean Countries

Here's every Caribbean nation and territory using the +1 country code, with their area codes:

Country/Territory	Area Code(s)
Anguilla	264
Antigua & Barbuda	268
Bahamas	242
Barbados	246
Bermuda	441
British Virgin Islands	284
Cayman Islands	345
Dominica	767
Dominican Republic	809, 829, 849
Grenada	473
Jamaica	876, 658
Montserrat	664
Sint Maarten	721
St. Kitts and Nevis	869
St. Lucia	758
St. Vincent & Grenadines	784
Trinidad & Tobago	868
Turks & Caicos	649

US Territories with +1:

Territory	Area Code(s)
Puerto Rico	787, 939
US Virgin Islands	340
Guam	671
American Samoa	684
Northern Mariana Islands	670

How US Area Codes Work

US phone numbers are 10 digits: a 3-digit area code plus a 7-digit local number. The format is (XXX) XXX-XXXX.

The area code identifies the geographic region. Some major examples:

212 - New York City (Manhattan)
310 - Los Angeles
312 - Chicago
305 - Miami
202 - Washington DC

Canada uses the same format. Toronto is 416, Vancouver is 604, Montreal is 514.

When you see a +1 number, the area code tells you whether you're calling New York, Jamaica, or Toronto.

Common Confusions About +1

"+1 is always the US" Not true. +1 876 is Jamaica. +1 242 is Bahamas. +1 416 is Toronto, Canada. The area code matters.

"I need to add a 0 before the area code" No. Unlike many European countries, North American numbers don't use a leading zero. Dial +1 212 555 1234, not +1 0212 555 1234.

"Calls within +1 countries are free or cheap" Not necessarily. Even though Jamaica and the US share the +1 code, calling between them is still an international call with international rates. The shared country code doesn't mean shared phone networks.

How to Dial +1 Numbers from Abroad

To call any +1 number from outside North America, use this format:

+1 (area code) (7-digit number)

Example: +1 212 555 1234

On a mobile phone, the + sign works everywhere. On a landline, you'll need your country's exit code first (00 in most of Europe, 0011 in Australia).

Rates vary wildly. Mobile carriers often charge $1-3/minute for calls to +1 numbers. VoIP services charge less but usually require subscriptions.

If you just need to make occasional calls to US landlines, browser-based services like World Dialer charge $0.04/minute. No subscription required. No app. Enter the number, make the call, pay for what you use.

Quick Reference

+1 + 3-digit code starting with 2-9 = US, Canada, or Caribbean
Check the area code to know which country
Format from abroad: +1 (area code) (number)
No leading zeros - ever

That's the +1 country code. Twenty-five countries, one dialing prefix, and a 3-digit area code that tells you exactly where your call is going.