# Toll-Free

A Toll-Free Sender ID is a US Toll-Free DID number used to send A2P SMS messages. Recipients see the DID number as the
message sender. It can also support replies when two-way messaging is available.

## Common uses

Use a Toll-Free Sender ID when recipients should see a US Toll-Free number and may need to reply. Common uses include:

- Customer care and support.
- Account and service notifications.
- Delivery and appointment updates.
- Authentication messages.
- Informational and marketing messages that meet the applicable requirements.

## How messages appear

Recipients see the approved Toll-Free DID number as the message sender. The same number can provide a consistent sender
for customer support, service notifications, and other approved business messages.

[![Example message from a Toll-Free Sender ID with instructions to reply STOP to unsubscribe or HELP for assistance.](../../../_images/toll-free.webp)](../../../_images/toll-free.webp)


**Fig. 1.** Example message from a Toll-Free Sender ID.

## Messaging and replies

Recipients can reply to messages sent from a Toll-Free Sender ID when two-way messaging is supported. To receive their
replies, use a Toll-Free DID number
that supports inbound SMS and assign it to an inbound SMS trunk. Recipients can reply only if their mobile network
supports it.

## Relationship with DID numbers

A Toll-Free Sender ID is a US Toll-Free DID number assigned to the DIDWW
account. Before including the number in a verification, either [purchase
it](../../../phone-numbers/buy-numbers/index.html) or [port an existing number to
DIDWW](../../../phone-numbers/number-porting/index.html).

The number must be active, available in [My Numbers](../../../phone-numbers/my-numbers/index.html),
and support **Outbound A2P SMS**. See the [supported feature
filters](../../../phone-numbers/buy-numbers/filters-reference.html).

A DID number already assigned to another Sender ID Verification cannot be
selected for a new verification.

## Availability

Toll-Free Sender ID availability is limited to the United States.

Check current availability on the [DIDWW website](https://www.didww.com/services/two-way-sms/a2p-messaging) or view the
available verification options in the [DIDWW User Panel](https://my.didww.com/#/sender_id_verifications/get_started).

## Verification requirements

Each Toll-Free DID number must be included in an approved verification before use. The submitted business identity,
messaging use case, consent process, sample messages, and supporting information must match the messages sent from the
number.

Approval does not guarantee message delivery or remove carrier sending limits. You must continue to follow all
applicable consent, content, and messaging requirements.

For required submission fields, see [Toll-Free
verification](../sender-id-verification-reference.html#toll-free-verification-reference).

To submit a verification, see [Create Toll-Free Sender ID
Verification](../how-to-guides/create-toll-free-verification.html).

## Using a verified Sender ID

After the verification becomes [Active](../sender-id-verification-reference.html#sender-id-verification-statuses), the
selected Toll-Free DID numbers can be used as Sender IDs. Associate the verification with an outbound
SMS trunk and send only messages that match the approved business and messaging use case.

For sending instructions, see [Send SMS using verified Sender
ID](../how-to-guides/send-sms-using-verified-sender-id.html) or the [HTTP
Specification](../../sms-trunks/technical-data/http-specification.html).

## Related resources

- [Create Toll-Free Sender ID Verification](../how-to-guides/create-toll-free-verification.html)
- [Sender ID Verification reference](../sender-id-verification-reference.html)
- [Sender ID content requirements](../compliance-content-requirements.html)
- [Sender ID types](index.html)

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