Network & carriers
The US shares +1 with Canada and 18+ Caribbean nations under the North American Numbering Plan (NANP) — the world's only country code covering multiple sovereign nations.
+1 · US · UTC-5
United States
Country Code & Virtual Numbers
The US anchors the world's largest single telecom market, sharing +1 with Canada and the Caribbean under the North American Numbering Plan. Capital: Washington D.C. · Business hours: 9:00 AM–5:00 PM EST.
// The Basics
What is the +1 country code?
United States's international dialing code is assigned by the ITU (International Telecommunication Union) and used for every call placed from outside the country.
Numbering format
US numbers use a 3-digit area code plus a 7-digit local number (10 digits total), with no leading digit to drop when dialing internationally.
Calling culture
Business calls are typically expected between 9 AM and 5 PM in the recipient's local time zone — the US spans six time zones, so confirm which one your contact is in before dialing.
Did you know
The 555 prefix, familiar from movies and TV, is reserved for fictional numbers and directory assistance — it was never assigned to real subscribers.
// Quick Facts
A quick read on United States numbers.
US numbers follow a strict 10-digit format — area code plus local number — with no variation across states, unlike many countries where code length changes by region. Rozper stores and dials contacts in full E.164 format automatically, so you never have to think about the formatting.
Want to call United States from abroad? Dial your local exit code, then 1, then the local number.
Best time to call United States from the US
United States is on UTC-5 · Business hours = – EST · Mon–Fri
// Why a Virtual Number
Why get a United States virtual number?
A +1 virtual number gives your business instant local presence in United States — without the overhead.
Local caller ID in United States
When you call from your virtual United States number, contacts see a local +1 number — dramatically improving answer rates.
No office needed
Establish a local presence in United States without renting space, hiring locally, or installing any hardware.
Instant credibility
In a market of six time zones and fierce local competition, a familiar area code is often the difference between an answered call and a missed one.
Routes to any device
Calls to your United States number ring your team on mobile, desktop, or desk phone — wherever they work.
// Platform Features
Everything to call United States
The tools to reach United States contacts reliably and scale your international presence globally.
150+ country coverage
Get virtual numbers in over 150 countries on the same platform — one dashboard, one bill.
HD voice quality
Crystal-clear calls over our optimised global carrier network. No degraded quality from international routing.
Call recording
Every call recorded and transcribed automatically. Review, share, and reference conversations easily.
Voicemail to text
Voicemails transcribed and delivered by email or SMS. Never miss a message across time zones.
CRM auto-logging
All calls to and from your international number auto-logged in Salesforce, HubSpot, or Zoho.
International analytics
Call volume, answer rates, and duration broken down by country, region, and time of day.
Local Caller ID
Show a local country number as your caller ID when dialling internationally. Improves pickup rates significantly.
Instant provisioning
Activate a new country number in under 60 seconds. No contracts, no hardware, no waiting.
99.99% uptime SLA
Enterprise-grade reliability for your international calling infrastructure, 24/7.
// Get Started
Get a United States number today
Active in under ten minutes. No contracts required.
- 01
Sign up
Create your Rozper account in under 2 minutes. No credit card required to start your free trial.
- 02
Get your number
Browse available numbers in your target country and activate instantly.
- 03
Configure routing
Route calls to any device. Set business hours, voicemail, and IVR from your dashboard.
- 04
Start calling globally
Make and receive international calls immediately. Active in under 10 minutes.
// Complete List
All world dial codes by country.
Every country and territory, every international dial code. Click a country to browse it.
List of World Countries and Their Dial Codes
CountryDial CodeRegionLocal Time
Showing all 237 countries & territories* Local time updates every minute
Frequently Asked
United States questions answered.
Answers about dialing across six time zones, the NANP numbering system, and setting up a US virtual number.
The international dialing code for United States is +1. When calling from the US, dial 011 + 1 + the local number. Rozper handles this automatically.
A United States virtual number goes live in under 10 minutes. Ask us how.
Start calling United States, not tomorrow.
Get a virtual United States number or make direct international calls to +1 — active in under ten minutes.