1 Country Code: United States (+1)
Country code 1 (+1) belongs to United States. United States uses the international dialing code +1, assigned by the International Telecommunication Union (ITU) under the E.164 standard. The ISO 3166-1 alpha-2 code is US.
You will see the same code written several ways depending on origin: +1 (universal + prefix, works from mobile), 001 (from countries that use 00 as their international exit code — most of Europe, Asia, and Latin America), 011 1 (from the US and Canada), 0011 1 (from Australia), or the bare 1. All refer to the same United States country code.
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The United States uses the North American Numbering Plan (NANP), shared with Canada and 18 Caribbean nations. Every US number is 10 digits — a 3-digit area code plus a 7-digit local number — and mobile numbers use the same area codes as landlines. When calling the US from abroad, dial +1 followed directly by the 10-digit number; there is no trunk prefix to remove.
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Did You Get a Call from +1? Here's What That Means
Any incoming call that displays +1 followed by more digits is originating from United States. The caller is dialing you from a United States-registered phone number — either a landline or a mobile on a United States carrier.
Common reasons people receive calls from +1:
- -Family or friends in United States calling from a local number
- -Business contacts at United States-based companies
- -Customer support agents working from a United States call center
- -Travel-related calls (hotels, airlines, tour operators)
- -Less commonly, robocalls or scam calls that have spoofed a +1 number — if the call is unsolicited, do not return it without verifying the source
To return a call to a +1 number from the US, use Kinvo's United States dialing guide — calls cost from $0.30/min with no app to download.
United States Phone Number Format
International Format Example
United States does not use a trunk prefix, so domestic and international formats are effectively the same — just prepend +1.
Major City Area Codes in United States
Area codes for the largest cities in United States. When dialing from abroad, prepend +1 and add no prefix.
| City / Region | Area Code | From Abroad |
|---|---|---|
| New York City | 212 | +1 212 |
| Los Angeles | 213 | +1 213 |
| Chicago | 312 | +1 312 |
| San Francisco | 415 | +1 415 |
| Miami | 305 | +1 305 |
| Washington DC | 202 | +1 202 |
Mobile Networks in United States
- No distinct prefix — mobiles and landlines share area codes
- Verizon
- AT&T
- T-Mobile
United States Telephone System Facts
Calling United States Successfully: Common Mistakes & Best Practices
Most failed calls to United States come from one of four mistakes, not from network problems. The most common is mishandling the country code itself: United States uses +1 with no trunk prefix to remove, so you dial it as-is. The most frequent error is adding a leading 0 by habit — there is none in the United States number plan.
The second is misreading the area code on landline numbers — United States area codes are not uniform length (New York City 212, Los Angeles 213, Chicago 312), so confirm the city before dialing. The third is dialing during off-hours — United States uses English business hours and consumer phones are usually answered between 8 AM and 9 PM local time. The fourth and most expensive mistake is assuming your US carrier's WiFi calling feature makes the call cheap. It does not — see WiFi calling vs VoIP for international calls for why.
For scam-call awareness: +1 is the legitimate United States country code, and most unsolicited calls from +1 numbers (which include US/Canada and 18 Caribbean nations under NANP) are legitimate calls from United States-based businesses, hospitals, family members, or call centers serving US customers. Caller-ID spoofing exists, so if a call from a +1 number claims to be from a US government agency, your bank, or the IRS, hang up and call the agency back on its published number. Real authorities never demand payment over the phone.
When you are ready to place a call, the cheapest reliable route is to dial +1 from your browser using Kinvo — no app, no carrier add-on, and the per-minute rate is shown before you connect so there are no bill surprises. The browser approach also works from any laptop, tablet, or phone you happen to have access to, which matters when you're traveling, using a work device, or borrowing someone else's computer.
Calling United States from Your Browser
To place a call to United States, dial +1 followed by the local number in the Kinvo browser dialer. Pay-as-you-go, no app required.
Call United States from Your Browser
Call any United States number (+1) directly from Chrome, Firefox, Safari, or Edge. No install required. Use it in under 2 minutes.
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Frequently Asked Questions: United States Country Code
Which country is country code 1?
Country code 1 belongs to United States. The full international dialing code is +1, also written as 001 from countries using 00 as their international exit code (Europe, most of Asia, Latin America), 011 1 from the US and Canada, or +1 from any mobile phone.
What is the country code for United States?
+1 is the international dialing code for United States, assigned by the ITU under E.164. The ISO 3166-1 alpha-2 code is US. Equivalent forms — 001, 011 1, +1, and 1 — all refer to the same United States country code. Note: +1 is shared across the North American Numbering Plan (US, Canada, and 18 Caribbean nations), so the 3-digit area code after +1 determines the actual destination.
What are the main area codes in United States?
The largest cities in United States use these area codes: New York City (212), Los Angeles (213), Chicago (312), San Francisco (415). When calling from abroad, prepend +1.
Who are the main mobile carriers in United States?
The major mobile operators in United States are Verizon, AT&T, T-Mobile. Kinvo routes calls to every United States mobile carrier at the same per-minute rate — no hidden surcharges for premium networks.
What is the emergency number in United States?
The emergency services number in United States is 911. Emergency numbers cannot be dialed via Kinvo or any VoIP service — use a mobile network or landline for life-threatening emergencies.
Can I call United States from my browser?
Yes. Kinvo connects calls to United States via WebRTC directly from Chrome, Firefox, Safari, or Edge. No app download. Sign up, add credits from $5, and dial +1 followed by the local number.