---
title: "The USA SMS Guideline"
slug: "usa-sms-guideline"
updated: 2026-05-11T19:35:22Z
published: 2026-05-11T19:35:22Z
canonical: "academy.insiderone.com/usa-sms-guideline"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://academy.insiderone.com/llms.txt
> Use this file to discover all available pages before exploring further.

# The USA SMS Guideline

You can refer to the SMS guideline for the United States to help you while onboarding.

This article provides details about:

- [Promotional Routes](/v1/docs/usa-sms-guideline#promotional-routes)
- [Transactional Routes](/v1/docs/usa-sms-guideline#transactional-routes)

| Locale Name | ISO Code | Region | Dialing Code | Available Routes |
| --- | --- | --- | --- | --- |
| United States | US | North America | +1 | Promotional Transactional |

## Promotional Routes

Below, you can see the guidelines for promotional routes:

| Available Sender IDs | Opt-out Options for Sender IDs |
| --- | --- |
| Dynamic Alphanumeric Sender ID is **not** **accepted** in the United States. Available Senders are: - Toll-Free - Dedicated Short Code | - Unsubscribe with External/Internal Link - Reply with Keyword |

## Transactional Routes

SenderID approval processes are the same for transactional routes to use the [SMS transactional API](/v1/docs/send-transactional-sms).