Sending SMS to United States
The United States is the largest A2P SMS market in the world by revenue, and also the most heavily gated. Since 10DLC registration became mandatory, every business sending from a standard ten-digit number must register a brand and a campaign with The Campaign Registry before carriers will deliver at scale. Unregistered traffic is not merely throttled — it is increasingly blocked outright.
How to dial United States
Every part of the number, laid out separately, then the same thing written the way an API expects it.
+1 — +1 (NPA) NXX-XXXX — three-digit area code, then a seven-digit number.
From abroad, replace your exit code with +, then 1, then the national number — dropping the national trunk prefix if the country uses one (a leading 0 in most, though not in this numbering plan). Store numbers in E.164 (+1…) and they work from any country and any API.
United States by the numbers
The figures below come from public country data and set the context for how much SMS traffic United States actually carries.
How your name appears in United States
What shows up in the recipient’s inbox, and what has to be true before it can.
Delivered on +1Sender ID rules for +1
Alphanumeric sender IDs are not supported. Traffic runs on 10DLC numbers, toll-free numbers, or short codes, each with its own registration path and throughput ceiling.
+1 (NPA) NXX-XXXX — three-digit area code, then a seven-digit number.Delivers across every major network in United States: AT&T, Verizon, T-Mobile, US Cellular.
What people send most: Appointment reminders for healthcare and services · Delivery and order status for e-commerce · Two-factor authentication.
Message length: under the standard SMS encoding, a segment typically holds 160 GSM-7 characters, or 70 once a message uses Unicode — Arabic, Chinese, Cyrillic, emoji. Longer messages split into several segments automatically and are billed per segment; exact limits are confirmed for United States as part of onboarding.
What United States requires
These are the constraints that decide whether a message is delivered, filtered or blocked — not general best practice.
Requirement 1 of 4: 10DLC brand and campaign registration is required before carriers will pass business traffic at volume.
10DLC brand and campaign registration is required before carriers will pass business traffic at volume.
Checked automatically on every message we send to United States — nothing for you to track by hand.
Mobile operators in United States
We deliver to every network below. Route quality is measured per operator, not averaged across the country.
4NetworksWhat businesses send in United States
Cuts no-shows more effectively than email — most people notice a text within minutes of it arriving.
Keeps the recipient's attention without needing an app open, for the moment they actually care about the update.
Time-critical — it has to land in seconds, which is the reason SMS still wins here over push or email.
All country calling codes
Looking for a different country? Pick a continent, or search by name, code or ISO — no need to go back to the directory page.
Antigua and BarbudaAG+1268
ArgentinaAR+54
BahamasBS+1242
BarbadosBB+1246
BelizeBZ+501
BoliviaBO+591
BrazilBR+55
CanadaCA+1
ChileCL+56
ColombiaCO+57
Costa RicaCR+506
CubaCU+53
DominicaDM+1767
Dominican RepublicDO+1
EcuadorEC+593
El SalvadorSV+503
GrenadaGD+1473
GuatemalaGT+502
GuyanaGY+592
HaitiHT+509
HondurasHN+504
JamaicaJM+1876
MexicoMX+52
NicaraguaNI+505
PanamaPA+507
ParaguayPY+595
PeruPE+51
Saint Kitts and NevisKN+1869
Saint LuciaLC+1758
Saint Vincent and the GrenadinesVC+1784
SurinameSR+597
Trinidad and TobagoTT+1868United StatesUS+1
UruguayUY+598
VenezuelaVE+58Other country codes
Countries with neighbouring dialling codes.
Start sending to United States
Direct routes, per-operator delivery reporting and sender ID handling for +1 — from one dashboard or one API call.