# Carrier

A Carrier Sender ID is a dynamic Sender ID selected according to the rules of the destination carrier. The business does
not choose or reserve the Sender ID that recipients see.

DIDWW also generates a `DDWW0xxxxx` Sender ID for submitting traffic. This value is different from the Sender ID that
recipients see.

## Common uses

Carrier Sender IDs are commonly used for:

- Authentication messages.
- Account, service, and delivery notifications.
- Messaging to supported Latin American countries.

Use this type when recipients do not need to see a fixed business name or phone number.

## How messages appear

The destination carrier determines the Sender ID that recipients see. It may not match the business name or phone
numbers in the DIDWW account, and it may change between messages.

[![Example message using a Carrier Sender ID with a link for help or opting out.](../../../_images/carrier.webp)](../../../_images/carrier.webp)


**Fig. 1.** Example message using a Carrier Sender ID.

## Messaging and replies

Carrier Sender IDs are intended for one-way messages. Recipients should not be expected to reply to the displayed Sender
ID. If recipients must reply to a fixed phone number, use a Long-code or Toll-Free Sender ID.

## Relationship with DID numbers

A Carrier Sender ID is not linked to a DID number in the DIDWW account. You do
not need to purchase, port, or assign a phone number to use this Sender ID
type.

## Availability

Carrier Sender ID availability varies by country.

View the available verification options in the [DIDWW User
Panel](https://my.didww.com/#/sender_id_verifications/get_started).

## Verification requirements

Before using this type, you must have an
[Active](../sender-id-verification-reference.html#sender-id-verification-statuses) Carrier Sender ID Verification. The
verification links the business and messaging use case to the destination countries submitted for review.

The DIDWW-generated Sender ID is created automatically and cannot be changed.
It is shown as a copyable value on the verification list, view page, and edit
page.

The business identity, message content, consent process, and messages sent must meet the requirements of each
destination country.

For required submission fields, see [Carrier
verification](../sender-id-verification-reference.html#carrier-verification-reference).

To submit a verification, see [Create Carrier Sender ID
Verification](../how-to-guides/create-carrier-verification.html).

## Using a verified Sender ID

After the verification becomes [Active](../sender-id-verification-reference.html#sender-id-verification-statuses), send
messages that match the approved business, destination countries, and messaging use case through the associated outbound
SMS trunk.

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 Carrier Sender ID Verification](../how-to-guides/create-carrier-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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