Verifying a Twilio Number

Some Twilio numbers require verification for outbound messaging in the United States.

What Is A2P 10DLC (US SMS Compliance)?

A2P 10DLC (Application-to-Person 10-Digit Long Code) is required by US carriers to ensure compliant, high-deliverability SMS messaging. To use SMS in the US with your Twilio number, you must complete this registration.

To send SMS in the US using Twilio, you must:

• Register your business

• Register a messaging campaign

• Assign your phone number to that campaign

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Step 1: Open the Trust Hub

1

Log in to Twilio Console

Once logged in, open the sidebar menu.

2

Go to Account → Trust Hub

3

You will see the list of compliance requirements, including A2P 10DLC.

4

Find US A2P Messaging or A2P 10DLC and click Register or Start Registration.

A2P registration has two main parts:

• Business Profile Registration

• Campaign Registration

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Step 2: Register Your Business Profile

Twilio must verify your business before you can register campaigns.

You’ll need to provide:

• Legal business name (must match official documents)

• Business type (LLC, Corporation, Sole Proprietor, etc.)

• EIN or registration number

• Business address

• Business phone number

• Website (if available)

Authorized Representative

• Full name

• Job title

• Email

• Phone number

Submit for verification.

Most business profiles are approved within minutes, but some take longer.

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Step 3: Register an A2P Messaging Campaign

Once your business profile is approved:

1

Go to Trust Hub → US A2P Messaging

2

Click Create Campaign

3

Provide:

• Campaign use case (ex: customer service, account notifications, verification codes, marketing, etc.)

• Campaign description

• Message samples (2–3 examples of SMS messages you will send)

• Opt-in method (how users consent to receive messages)

• Opt-out instructions (e.g., “Reply STOP to unsubscribe”)

Message samples must match real usage or the campaign may be rejected by carriers.

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Step 4: Assign Your Phone Number

After creating your campaign:

1

Go to Phone Numbers → Manage → Active Numbers

2

Select the Twilio number you want to use.

3

Scroll to A2P 10DLC section.

4

Assign the number to your newly registered campaign.

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Step 5: Wait for Approval & Test

• Campaign approval may take anywhere from a few hours to several days.

• Once approved, your Twilio number is fully authorized for US SMS messaging.

• After approval:

  • Send a test SMS

  • Confirm delivery

  • Ensure the number is linked inside your assistant’s settings in Call Agent AI

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Notes & Fees

• Use accurate business information to avoid delays.

• Opt-in/opt-out language is required for all campaigns.

• Carriers may reject campaigns with unclear or generic message samples.

• Twilio charges small fees for A2P registration and monthly campaign fees.