+1 is the calling code of United States (also Canada, American Samoa, Anguilla, Antigua & Barbuda, Bahamas, Barbados, Bermuda, British Virgin Islands, Cayman Islands, Dominica, Dominican Republic, Grenada, Guam, Jamaica, Montserrat, Northern Mariana Islands, Puerto Rico, Sint Maarten, St. Kitts & Nevis, St. Lucia, St. Vincent & Grenadines, Trinidad & Tobago, Turks & Caicos Islands, U.S. Virgin Islands).
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| Country | From abroad |
|---|---|
 United States | +1 … |
 Canada | +1 … |
 American Samoa | +1 … |
 Anguilla | +1 … |
 Antigua & Barbuda | +1 … |
 Bahamas | +1 … |
 Barbados | +1 … |
 Bermuda | +1 … |
 British Virgin Islands | +1 … |
 Cayman Islands | +1 … |
 Dominica | +1 … |
 Dominican Republic | +1 … |
 Grenada | +1 … |
 Guam | +1 … |
 Jamaica | +1 … |
 Montserrat | +1 … |
 Northern Mariana Islands | +1 … |
 Puerto Rico | +1 … |
 Sint Maarten | +1 … |
 St. Kitts & Nevis | +1 … |
 St. Lucia | +1 … |
 St. Vincent & Grenadines | +1 … |
 Trinidad & Tobago | +1 … |
 Turks & Caicos Islands | +1 … |
 U.S. Virgin Islands | +1 … |
If a number starts with +, the first 1–3 digits are the country code. If it starts with 0 (8 in Russia and Kazakhstan), it is a domestic number: an area or operator code follows, and from abroad the 0 or 8 is replaced with + and the country code. The same digits can mean different places, so where the call came from matters.