The +1 prefix belongs to United States. If you got a call or text from a number starting with +1 (calling code 1), it came from United States.
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Code
+1
ISO
US
Region
Americas
Time zone
America/New York
The +1 code identifies United States on the international telephone network. Country code 1 is assigned to United States under the ITU-T E.164 numbering plan, so any phone number that begins with +1 — written +1 or 001 — is a United States number.
Every United States number in international format follows this shape — colour-coded so you can see where the country code ends and the local number begins.
When dialing United States from abroad, the only fixed part is +1 — that's the country code. The rest depends on whether you're calling a mobile or landline number inside United States.
+X XXX XXX XXXX
Example: +1 201 555 0123
+1 XX XXXX XXX
Include the area code if applicable. Omit any leading 0.
Enter the country code +1 when dialing United States from abroad.
Add the local phone number (in most countries, drop the leading zero).
Use TwinPhone to connect the call at low per-minute rates.
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Example numbers for United States:
Dialing codes immediately above and below +1 in the ITU plan — handy if you mistyped a digit or are dialing across a region.
Everything you need to know about TwinPhone.
The +1 code belongs to United States. Any phone number that starts with +1 — or with 001 — is a United States number.
The 001 prefix is United States. The 00 is the international exit code dialed from Europe and many other regions; it is followed by +1, the United States country code.
Dialing code 1 (dialed as +1 or 001) belongs to United States. Any phone number that starts with +1 is a United States number.
Country code 1 is the ITU-T E.164 calling code for United States. To call United States from abroad, dial +1 followed by the national number.
The country code (international dialing code) for United States is +1. To call United States from abroad, dial +1 followed by the national number (in most countries, without its leading zero).
+1 is United States's international country calling code under the ITU E.164 plan — often searched as the "1 area code". Any phone number starting with +1 is a United States number.
From TwinPhone, just type +1 and the number — we connect it. From a landline, dial your exit code, then +1, then the number (in most countries, without the leading 0).
United States's current local time is shown live on this page. Check it before calling so you reach people during waking hours.
Yes! Virtual numbers in United States start at $1.60/month. Use it as your caller ID so people see a local number, or receive incoming calls directly in your browser.
Calling United States with TwinPhone starts from $0.02/min, billed by the minute (rounded up to the next full minute). It is pay-as-you-go from your browser — no connection fee and no monthly fee. The exact per-minute price for +1 landlines and mobiles is shown live on this page.
Yes. TwinPhone works entirely in your web browser — Chrome, Edge, Safari, or Brave on desktop or mobile. There is no app to install and no SIM card: open the site, add credit, dial +1 and the United States number, and the call connects.
A +1 number is not automatically a scam — +1 is simply the country code 1 assigned to United States under ITU-T E.164, so the call or text came from United States. If you do not know anyone there, treat an unexpected +1 call with the same caution as any unknown number: do not call back blindly and do not share personal details. Costs to call United States are shown above.
Dial +1 with TwinPhone — no SIM, no app, right from your browser.
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