United States country code, +1 explained.
Everything you need to call United States with Twiching — full dialing format, step-by-step guide, and Tier-1 CLI routes that land every call.
United States
Washington D.C. · Americas
· COUNTRY INFO · VERIFIED
- ISO Alpha-2
- US
- Capital
- Washington D.C.
- Region
- Americas
- Timezone
- UTC−5 to UTC−8
· DIALING GUIDE · VERIFIED
FULL DIAL FORMAT
011 · +1 · XXX · XXXX
How United States numbers break down
A complete number to United States follows this pattern. Twiching adds the exit and country codes automatically when you dial from the app.
EXIT CODE
Dial from the US/Canada to leave the country.
COUNTRY CODE
Routes the call directly into United States.
AREA / MOBILE
Regional or mobile prefix — drop the leading 0.
LOCAL NUMBER
The subscriber's local number.
COMPLETE NUMBER FORMAT
011 · +1 · XXX · XXXX
United States on the map
Washington D.C. · Americas
ROUTE
Tier-1 Direct
CLI
Verified
ASR
60%+ min
How to call United States
Click any step — watch the full dial string build piece by piece.
FULL NUMBER FORMAT
011 · +1 · XXX · XXXX
Twiching automatically adds the exit and country codes — just enter the local number.
United States —
connected across every carrier.
191
Countries in directory
UNITED STATES INCLUDED
99.97%
Call delivery rate
STIR/SHAKEN
500+
Carrier interconnects
TIER-1 DIRECT
60%+
Guaranteed ASR
REAL-TIME ROUTING
United States
Americas · US
United States numbering plan & how to dial
United States is part of the North American Numbering Plan (NANP). Every number is +1 followed by a 3-digit area code and a 7-digit subscriber number — 10 digits in total. There is no national trunk "0": domestically you dial 1 + area code + number.
Mobile coverage in United States comes from 3 major networks — AT&T, Verizon, T-Mobile — with internet penetration at 91%. VoIP is permitted and regulated by FCC. Language (English) and currency (USD) both matter here for IVR, SMS, and scheduling support around local business hours.
Numbering across the Americas mixes the North American Numbering Plan (+1) with national E.164 plans, so mobile and fixed-line prefixes vary from country to country.
Adding 011 before a +1 number
Calling United States from the US or Canada? Drop the 011 — NANP numbers only need a leading 1.
Expecting a national trunk "0"
There's no trunk "0" anywhere in the NANP format — it's always 1, then the 3-digit area code, then the 7-digit number.
Dropping the area code
Every United States number is a full 10 digits; the 3-digit area code is always required, even locally.
Permitted — FCC regulated
Regulated by FCC
- STIR/SHAKEN enforced
- E911 mandatory
- TCPA compliance required
US → United States
$0.004/min
per minute
United States → US
$0.004/min
per minute
More in Americas
Business calling to United States
Local US caller ID
Present a United States +1 number so prospects in Washington D.C. and nationwide recognise the call and are more likely to answer.
Americas outbound & support
Run sales and support lines into United States over Tier-1 routes that interconnect with networks like AT&T.
Follow-the-sun coverage
Staff United States hours (UTC−5 to UTC−8) with routing that sends calls to the right team at the right local time.
FAQ
Calling United States — frequently asked questions
The subscriber portion of a United States number is 4 digits, after the country code and area/mobile prefix. That's the part that identifies the specific line once the call has been routed to the right network.
English is the primary language in United States — IVR prompts, SMS copy, and support scripts should be written in it for the best response rates. Getting the greeting and menu options right in the local language is often the difference between a caller staying on the line or hanging up.
United States has 91% internet penetration, which is a useful signal for how reliably VoIP and SMS-based channels will perform there. Higher penetration generally means more consistent call quality and app-based delivery for messaging.
Yes, where locally supported — a single Twiching United States number can handle both voice calls and SMS. That avoids the overhead of provisioning and managing two separate numbers for one customer-facing line.
Where locally supported, yes — Twiching's United States numbers can send and receive SMS in addition to voice calls. That makes a single number usable for both two-way conversations and outbound notifications.
Since United States is on UTC−5 to UTC−8, plan calls around local business hours there rather than US hours — off-hours calls tend to go unanswered. It's worth checking the current time difference before a first outreach call, since it can shift with daylight saving in either country.
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