# SMS numbers · Long codes, short codes, toll-free, and sender IDs

## The right identity.  For the destination.

Compare sender options for the United States and the registration each one needs.

  United States

 Long codeToll-freeBrand name
  +1 (202) 555-0188 Dedicated number

Replies
Send and receive

Registration
10DLC

  Registration required

Register your brand and campaign, then link your number.

[Explore SMS senders](/docs/guides/sms/senders)
Interactive illustration with fictional records. No account operation is performed.

[Explore SMS senders →](/docs/guides/sms/senders)

[Global delivery Understand destination support before sending. →](/docs/guides/sms/overview)

[Two-way SMS Receive customer texts and reply from your application. →](/sms-api/features/two-way)

[Consent & opt-outs Honor the choices customers make about your messages. →](/sms-api/features/compliance/opt-out)

[Explore SMS →](/sms-api)

## Scale without  losing control.

Organize teams in workspaces, control API access, and trace changes through audit logs.

Harbor Organization
Workspaces Production Sandbox

### Delivery agent

API key · Customer operations team
Active
Permissions Access
Email Read & write
SMS Read & write
WhatsApp Read Read & write
AL Alex Lee Admin  Permissions updated

### Audit log

Production
 API key updated Alex Lee · 09:42:18 UTC

Workspace
Production

Resource
Delivery agent

WhatsApp
Read Read & write

Succeeded

 [Workspaces](/docs/guides/workspaces)[Team roles](/docs/guides/users-teams-roles)[API authentication](/docs/guides/authentication)
[Explore Enterprise](/enterprise)

## Start with SMS. Build across channels with Bird.

[Get started](/dashboard/signup?returnTo=%2Fdashboard%2Fw%2Fsms%2Fonboarding) · [Contact Sales](/demo?product=sms)

[Email](/email-api) · [SMS](/sms-api) · [WhatsApp](/whatsapp-api) · [Apple Messages](/apple-messages-api) · [Voice](/voice-api)



## Related resources

- [Registering your SMS sender ID](/learn/sms/registering-your-sms-sender-id) (video)
- [What is sender ID registration, and why do some countries require it?](/explained/sms/what-is-sender-id-registration) (answer)
- [Build your first integration](/learn/paths/integration) (course)
- [SMS sender IDs](/sms-api/features/compliance/sender-id-registration) (product)

[Get an implementation brief](/learn/workspace?topic=sms-senders)