What is A2P 10DLC? A Simple Guide for Businesses

What is A2P 10DLC?

A2P 10DLC stands for Application-to-Person 10-Digit Long Code — a U.S. carrier framework that lets businesses send text messages at scale using standard 10-digit phone numbers.

Before this system, bulk SMS via long codes was treated as grey-route traffic, leading to heavy carrier filtering. A2P 10DLC fixes that by giving registered businesses verified sender status—resulting in better deliverability, higher throughput, and lower spam filtering risk.

Why Does A2P 10DLC Matter?

If your business sends SMS or MMS to U.S. phone numbers, you are required to register under A2P 10DLC. Sending without registration risks message filtering or outright blocking by major U.S. carriers like AT&T, Verizon, and T-Mobile.

The risk is even greater for companies that use SMS tools built on platforms like Salesforce. Unregistered traffic can throw your entire flow of messaging out of whack.

Benefits of A2P 10DLC registration:

• Increased message throughput (MPS) versus unregistered long codes
• Reduced spam filtering by U.S. carriers
• Improved deliverability and sender trust
• Compliance with U.S. telecom regulations

Who Needs to Register?

Any business sending SMS/MMS to U.S. numbers using long codes must register. Here’s how to determine your path:

Step 1 — Brand Type

Step 2 — Campaign Use Case

• Standard use cases — marketing, notifications, customer care, OTPs
• Special use cases—political, charity, sweepstakes (require additional carrier approval)

How Long Does A2P 10DLC Registration Take?

The registration process has three stages:

1. Business Profile — completed in minutes if your information is ready
2. Brand Registration — typically within 24 hours; up to 7 days if manual review is triggered
3. Campaign Registration — standard use cases take approximately 7 business days

To avoid delays, have your EIN (Employer Identification Number) ready before you start, and ensure all business information is accurate and consistent.

A2P 10DLC and Your SMS Platform

If you use an SMS and WhatsApp messaging product integrated with Salesforce or any CRM, your provider likely sends all traffic as A2P — meaning registration isn’t optional; it’s mandatory.

Platforms like MessageBlink handle SMS and WhatsApp messaging natively within Salesforce. To keep your campaigns running without interruption, you need to register for A2P 10DLC before sending any messages to the U.S.

Real Life Example: How A2P 10DLC Saved a Healthcare Brand’s SMS Campaign
A mid-size U.S. healthcare company was sending appointment reminders and follow-ups to thousands of patients monthly via long code numbers and without registration.
Within weeks, T-Mobile and AT&T started filtering their messages. The delivery rate dropped from 94% to less than 40%. Patients missed appointments, and the support team was overwhelmed with complaints.

They signed up with a standard brand with a customer care use case. The entire process—brand, profile, and campaign—was done in under 10 business days.
The outcome? Delivery rates recovered to 96%, throughput increased significantly, and carrier filtering almost disappeared.

Bottom Line

A2P 10DLC is not optional for U.S. SMS messaging — it’s the baseline for legitimate business texting. Register early, keep your business information accurate, and choose an SMS platform that guides you through compliance from day one.

Talk with our expert for more guidance.

Download MessageBlink from AppExchange.

Start Your Free Trial